Chapter 15

Dreams, Hallucinations, and Altered States

A. The Critic’s Argument: NDEs Are Just Dreams in Disguise

Have you ever had a dream so vivid that you woke up confused, wondering for a moment whether it really happened? Most of us have. And that common experience is exactly what some skeptics want you to think about when you hear stories of near-death experiences. Their argument goes something like this: a brain that is shutting down, or a brain that is coming back online after a severe crisis, is doing something very similar to what your brain does every night when you fall asleep. The strange visions, the feelings of peace, the sensation of floating, the encounters with deceased relatives—these aren’t evidence that consciousness leaves the body. They’re just dreams. Fancy, intense, unusually vivid dreams—but dreams all the same.

Nobody makes this argument with more neurological detail than Michael Marsh. His Chapter 7 in Out-of-Body and Near-Death Experiences—titled “Falling Asleep, Perchance to Dream—Thence to Reawaken”—is perhaps the most technically sophisticated attempt to explain NDEs as dream-state phenomena ever written by a medical professional.¹ Marsh doesn’t just casually wave his hand and say, “It was probably a dream.” He builds a detailed neurophysiological framework. He walks us through the sleep cycle, the neuroscience of dreaming, the mechanics of REM (rapid eye movement) and NREM (non-rapid eye movement) sleep, and the strange twilight zones that exist at the borders of consciousness—the hypnagogic state (that drowsy period as you’re falling asleep) and the hypnopompic state (the hazy transition as you’re waking up).

His core argument can be summarized in a few key claims. First, Marsh contends that NDEs happen not while the brain is “dead” but during the brief window when the brain is waking back up—recovering from whatever crisis hit it. He compares this to the fact that dreams are produced when specific areas of the brain, especially the prefrontal cortex (the brain region responsible for critical thinking and self-monitoring), are temporarily shut down or disconnected.² If subconscious dream-mentation (that’s the technical term for mental activity during sleep) can be produced when key brain areas are offline, Marsh reasons, then similar subconscious imagery could also be produced when a brain recovering from cardiac arrest or another crisis hasn’t yet reconnected all its parts.³

Second, Marsh points to the phenomenological parallels—the ways in which the actual content of NDEs looks a lot like the content of certain dream states. He highlights the vestibular sensations common to both experiences: the floating, the spinning, the feeling of being hurled through space. He notes the vivid visual imagery, the emotionally charged encounters, the presence of deceased relatives.⁴ He points to data from centrifuge experiments on military aircrew, where rapid-onset loss of consciousness produced dreamlike experiences with vestibular components, vivid imagery, and a sense of floating—all within a carefully timed twelve-second window.⁵

Third, and this is the claim I want you to pay special attention to, Marsh dismisses the testimony of NDErs who insist their experience was not a dream. He writes that these people “are not conversant with the numerous forms of dream-state modes now neurophysiologically defined.”⁶ In other words: you say it wasn’t a dream because you don’t know enough about the many different kinds of dreams your brain can produce. You just don’t realize you were dreaming.

Marsh draws connections between NDEs and hypnagogic hallucinations—those dreamlike images that pop up as you’re drifting off to sleep. He describes how hypnagogic experiences can include floating, tunnel sensations, brilliant chromatic imagery, auditory phenomena like hearing your name called or hearing chime-like bells, and even the sudden eruption of “complete knowledge”—all features found in NDE reports.⁷ He also discusses sleep paralysis (a condition where you wake up but can’t move your body) and narcolepsy, noting that elements of REM sleep can intrude into wakefulness through breakdowns in the brain’s “state boundary controls.”⁸

Fischer and Mitchell-Yellin, working from a philosophical rather than a neurological angle, make a complementary argument. In their discussion of NDEs as vivid experiences, they invoke Oliver Sacks’s research on hallucinations to argue that even strikingly vivid, lucid hallucinations can be produced by well-understood physical mechanisms like sensory deprivation, epilepsy, drug intoxication, and the hypnagogic state.⁹ They compare NDEs to lucid dreams—dreams in which you know you are dreaming and which can feel astonishingly real—and argue that nobody treats the vividness of a lucid dream as evidence for non-physical mechanisms.¹⁰ Why, they ask, should we treat the vividness of an NDE any differently?

Meanwhile, neurologist Kevin Nelson, whose work Fischer and Mitchell-Yellin approvingly cite, argues that NDEs occur when “part of the dreaming brain erupts in a brain already awake.”¹¹ He proposes that the blending of REM consciousness with waking consciousness creates experiences that feel intensely realistic and memorable. Nelson’s hypothesis is that people who are predisposed to NDEs may have more permeable state boundaries between wakefulness and REM sleep.

Taken together, these critics present an imposing case. They’re essentially saying: your brain is an enormously creative organ. It produces vivid dreams every single night. When it’s stressed, damaged, or recovering from crisis, it can produce even more extraordinary hallucinations and dreamlike experiences. NDEs are just one more variety of this well-documented phenomenon. There’s nothing here that requires us to invoke souls, spirits, or consciousness floating free of the body.

Fair enough. That’s the argument. Now let me show you why it doesn’t work.

B. Identifying Weaknesses: Where the Dreaming Hypothesis Falls Apart

Before we get to the strongest pro-NDE evidence, I want to point out some problems with the dreaming hypothesis that are visible even on its own terms. These are weaknesses that show up when you look carefully at what the critics are actually claiming.

1. Marsh Assumes What He Needs to Prove

Marsh’s entire argument rests on a premise he states openly in his introduction: NDEs are “brain-state phenomena generated by metabolically disturbed brains especially during the period when they are regaining functional competence.”¹² But that is precisely the question at issue. You can’t assume that NDEs are produced by recovering brains and then use that assumption to explain how NDEs are produced by recovering brains. That’s circular reasoning. The entire debate is about whether NDEs are brain-generated or whether they reflect consciousness operating independently of the brain. Marsh treats the brain-generation theory as an established starting point rather than a contested hypothesis that must account for all the evidence.

This matters because it shapes everything that follows in his argument. When Marsh finds a parallel between NDEs and a known brain phenomenon, he treats that parallel as confirmation that NDEs are brain-generated. But if you haven’t established that premise first, the parallel could be evidence for something else entirely. It could be evidence that the brain is involved in mediating or filtering the NDE rather than producing it—just as the ear is involved in hearing without being the source of the sound. The parallels Marsh identifies are real, but they are ambiguous. They are consistent with his hypothesis, but they are equally consistent with the filter/transmission model. He never considers that possibility, because his starting assumption rules it out before the investigation begins.

Philosopher of science Karl Popper reminded us that a good scientific hypothesis must be falsifiable. What would it take to falsify Marsh’s hypothesis? If every piece of evidence—including veridical perception, blind NDEs, and the “more real than real” phenomenology—is automatically reinterpreted as a product of the recovering brain, then nothing could ever count against the theory. When a theory can explain everything and be refuted by nothing, it has left the realm of science and entered the realm of dogma.

2. Phenomenological Similarity Does Not Prove Identity of Cause

Marsh spends considerable effort showing that some features of NDEs resemble some features of dreams. The floating. The tunnel. The vivid imagery. But similarity between two experiences does not prove they have the same cause. Think about it this way. If you see a live concert and then watch a high-definition recording of that same concert on your television, the two experiences might look and sound remarkably similar. But nobody would say the television produced the concert. The television is a receiver and reproducer of signals. The similarity of the output tells you nothing definitive about the origin of the signal.¹³

This is exactly the point made by the filter or transmission model of consciousness, which we discuss more fully in Chapter 25. If the brain functions as a filter or receiver of consciousness rather than a producer of it, then of course brain states will be correlated with conscious experiences. That’s what a receiver does. But correlation is not causation. The fact that certain brain patterns accompany certain experiences does not prove the brain is creating those experiences from scratch.

3. Marsh Dismisses Experiencer Testimony on Patronizing Grounds

Remember Marsh’s claim that NDErs “are not conversant with the numerous forms of dream-state modes”? This is a remarkably patronizing dismissal of firsthand testimony from thousands of people. Many NDErs are educated, intelligent, psychologically healthy adults who are perfectly capable of distinguishing between a dream and waking reality. Some of them are medical professionals. Some have extensive experience with vivid dreams, lucid dreams, and even hallucinations—and they consistently report that the NDE was fundamentally different from all of these.¹⁴

When a researcher tells a surgeon or a nurse or a professor that they simply weren’t educated enough about dreaming to know they were dreaming, that tells us more about the researcher’s assumptions than about the experiencer’s competence.

4. The Centrifuge and Syncope Data Actually Undermine Marsh’s Case

Marsh points to centrifuge experiments and hyperventilation-induced syncope (fainting) as evidence that crisis-brains produce NDE-like imagery. He’s right that these experiments produced some experiential features that overlap with NDEs—floating sensations, tunnel-like visual effects, vivid imagery, a sense of peace.¹⁵ But there is a crucial difference that Marsh himself acknowledges, almost in passing: “Subjects recovering from induced syncope or centrifugation were clearly aware that they were not approaching death and therefore were not going to die, unlike the majority of NDErs.”¹⁶ More importantly, none of these experimental subjects reported veridical perception of real events happening outside their bodies. None of them described accurate details about their environment that could be independently confirmed. None reported meeting deceased relatives who communicated specific, verifiable information. The centrifuge produced dreamlike fragments. It did not produce what NDEs produce.

5. Fischer and Mitchell-Yellin Concede Too Much

To their credit, Fischer and Mitchell-Yellin make a more careful argument than many skeptics. They actually concede that NDEs are distinctive in combining vividness with coherence, and they grant that “this combination is important and distinctive of near-death experiences” and that it “gives some reason to believe that their contents are accurate.”¹⁷ That is a significant concession. But then they retreat to the claim that vividness and coherence alone don’t provide “overwhelming” evidence for supernaturalism. And here, I actually agree with them—partially. No one is arguing that vividness alone proves NDEs are real. That would be a bad argument. The case for NDEs has always been cumulative, built on multiple independent lines of evidence converging on the same conclusion. Vividness is one strand. Veridical perception is another. And as we’ll see, it’s the veridical strand that the dreaming hypothesis simply cannot touch.

C. The Pro-NDE Response: Why NDEs Are Not Dreams

Now we come to the heart of the matter. The dreaming hypothesis might sound plausible in the abstract. But when you examine it against the full range of NDE evidence, it collapses. There are at least six major reasons why NDEs are not dreams, hallucinations, or any other kind of altered brain state.

1. NDEs Are Described as “More Real Than Real”—The Opposite of Dreams

This point is so important that I want to make sure it doesn’t get lost. When people wake up from a dream, they know they were dreaming. The dream felt real while it lasted, but once waking consciousness returns, the dream fades. It feels less vivid, less substantial, less real than ordinary waking experience. That is a nearly universal human experience. We all know what it’s like to realize, “Oh, that was just a dream.”

NDErs report exactly the opposite. They describe the NDE not as something that felt dream-like, but as something that felt more real than anything they had ever experienced before—more real than the chair you’re sitting in right now, more real than the book in your hands. This is not a minor detail. It is a consistent, cross-cultural, repeatedly documented feature of NDEs. Jeffrey Long’s research, based on thousands of cases collected through the Near-Death Experience Research Foundation, shows that the vast majority of NDErs describe their experience as “definitely real.”¹⁸

Now think about what this means. If NDEs were dreams, we would expect them to be experienced as dreams. We would expect them to have that familiar dream-like quality: vivid in the moment but fading and shifting upon awakening, recognized in hindsight as products of the sleeping brain. Instead, the opposite happens. NDErs typically report that ordinary waking life seems less real by comparison. The experience doesn’t fade—it stays with them for years, sometimes decades, with a vividness that ordinary memories simply cannot match.¹⁹

Researchers Marie Thonnard and colleagues at the University of Liège published a study in 2013 that put this to the test. They compared the memory characteristics of NDEs with the memory characteristics of real events and imagined events, using a standardized tool called the Memory Characteristics Questionnaire. Their finding? NDE memories had more characteristics of real memories than even verified real memories did—and significantly more than imagined events or dreams.²⁰ The experiences weren’t just remembered as real. They had the specific measurable features that characterize memories of things that actually happened.

J. Steve Miller puts it well. He points out that we distinguish reality from dreams precisely by the vividness and quality of our conscious experience. If someone asked you right now, “How do you know you’re not dreaming?” you’d say something like: “Because my experience right now has a quality of reality that dreams don’t have. I can feel things, see things, hear things in a way that tells me this is waking life.” But that is precisely what NDErs are saying about their experience. The qualitative difference between their NDE and ordinary dreams is exactly the same kind of difference you and I rely on every day to tell reality from dreaming.²¹

2. Dreams Do Not Produce Veridical Perception of Real Events

This is the single most devastating problem for the dreaming hypothesis, and it is the problem that Marsh, Fischer, and Nelson all fail to adequately address.

Dreams do not give you accurate perceptions of the external world. When you dream, you experience internally generated imagery. You might dream about being at the beach, but your dream doesn’t give you accurate information about what is actually happening at the beach right now. You might dream about a conversation with a friend, but your dream doesn’t reproduce a real conversation that your friend is having at that moment in another room. Dreams are, by definition, internally produced—they draw on stored memories, fears, desires, and random neural firings. They do not function as windows onto external reality.

But veridical NDEs do exactly that. As we documented in Chapters 4 and 5, there are now over one hundred cases in the research literature where clinically dead or deeply unconscious patients accurately reported real events happening around them or in distant locations—events that were subsequently verified by independent witnesses.²² Rivas, Dirven, and Smit’s remarkable volume The Self Does Not Die catalogues these cases with careful attention to verification methods, and Janice Holden’s analysis of veridical OBE reports found a 92 percent accuracy rate.²³

Consider the well-known dentures case from Pim van Lommel’s Lancet study. A man was brought into the hospital in a deep coma, with no pulse or blood pressure. A nurse removed the man’s dentures during the resuscitation effort and placed them in the drawer of a crash cart. Days later, when the man regained consciousness, he recognized the nurse and told her where she had put his dentures—accurately describing the specific drawer of the specific cart. He described all this from a vantage point above his body while he was being resuscitated.²⁴

Now, ask yourself: can a dream do that? Can a dream produce accurate information about the location of an object placed in a specific drawer by a specific nurse during a medical procedure while the patient’s heart was stopped and his brain was receiving no blood flow? No dream theory in the entire history of sleep research has ever claimed that dreams can produce veridical information about the external environment. That is simply not what dreams do.

Or consider the cases documented in The Self Does Not Die where patients reported events occurring in entirely different rooms or even different floors of the hospital. Case 2.4 describes a patient who, during cardiac arrest, perceived specific conversations and events in a waiting area far from the operating room—details later confirmed by family members who had been present in that area.²⁵ Dream imagery is drawn from stored memories. It cannot access real-time information about events happening in distant locations. No dream can give you a live feed of what your family is doing in a waiting room three floors away.

Miller offers a brilliant analogy that exposes the logical gap in the dreaming argument. Imagine you’ve just had brain surgery. You tell your neurologist, “I actually walked out of the hospital this morning and had coffee at the Starbucks next door.” The neurologist responds: “After surgery of this nature, patients often slip in and out of REM sleep in ways that produce vivid hallucinations. Since we know the brain can produce dreams of this kind, there’s no reason to believe you actually went to Starbucks in your hospital gown.” Fair enough—as far as it goes. But then you hold up your Starbucks cup and receipt, dated that morning. “Why don’t you call Starbucks and ask the baristas if they just served a patient in a hospital gown?”⁶⁰

That is exactly the situation with veridical NDEs. Showing that the brain can produce dream-like experiences does not prove that this particular experience was a dream—especially when the experience includes independently verifiable details that dreams cannot produce. The skeptic who dismisses all NDE reports as dreams without addressing the veridical evidence is like a doctor who refuses to examine the Starbucks receipt because he already knows, in advance, that the patient couldn’t possibly have left the hospital.

Holden’s meta-analysis is worth dwelling on for a moment. She examined every published case of a veridical OBE claim from the NDE literature—every case where a patient reported perceiving something during their NDE that could be checked against external reality. She found that out of ninety-three such cases, fully 92 percent were completely accurate. Another 6 percent contained some accurate and some inaccurate elements. Only 1 percent were completely inaccurate.⁶¹ Stop and think about what a 92 percent accuracy rate means. If NDEs were dreams, constructed from stored memories and random neural noise, we would expect the “veridical” elements to be right roughly as often as a lucky guess—maybe 10 or 20 percent of the time. Instead, they are right more than nine times out of ten. That is not the accuracy profile of a dream. That is the accuracy profile of genuine perception.

We should also note that many of these veridical reports were made immediately upon the patient’s regaining consciousness, in the presence of medical staff who could confirm the details. These are not stories that were polished and embellished over years of retelling. They are spontaneous reports, often made while the patient was still disoriented from the medical crisis, that were confirmed on the spot by nurses, doctors, and family members who had been present during the events described.⁶²

Marsh is aware of the veridical cases, of course. He engages the Pam Reynolds case at length (pp. 19–27) and dismisses the veridical evidence as “unimpressive.”²⁶ But his dismissal, as we showed in Chapter 5, relies on demanding a level of perceptual precision from the OBE that we would never demand from a fully conscious, healthy eyewitness. And he fails to engage the broader body of veridical evidence—the dozens upon dozens of verified cases that have accumulated since his book was published.

3. People Who Have Experienced Both Dreams and NDEs Say They Are Fundamentally Different

This is a point that Marsh dismisses but should not dismiss. Jeffrey Long’s extensive research with the Near-Death Experience Research Foundation (NDERF) has produced something very useful: data from large numbers of people who have experienced not only NDEs but also vivid dreams, lucid dreams, and hallucinations. These are people who know from personal experience what it feels like to have a vivid dream. They know what it feels like to hallucinate. And they report, consistently and emphatically, that the NDE was nothing like any of those experiences.²⁷

Long found that NDErs who had also experienced drug-induced hallucinations overwhelmingly reported that the NDE was categorically different—different in kind, not merely in degree. The NDE felt more real, more coherent, more meaningful, and more transformative than any hallucination or vivid dream they had ever had.²⁸ When Marsh tells these individuals they simply weren’t aware of the “numerous forms of dream-state modes,” he is patronizing people who have direct comparative experience that he lacks.

Laurin Bellg, an ICU physician who has collected NDE accounts from her own patients over many years of critical care practice, makes a similar observation. Her patients who reported NDEs were often experienced with medical crises, altered mental states, and drug-induced sedation. They had been in ICUs before. They had had dreams under sedation before. And yet they insisted, sometimes with tears, sometimes with frustration at not being believed, that the NDE was qualitatively different from anything else they had experienced.²⁹ Bellg notes that research confirms that NDEs are qualitatively different from hallucinations or dreams, and that there is no relationship between NDEs and mental disorder. She found that the deeper the NDE—the more features it contained and the more intense it was—the more likely it was to provoke a dismissive or harmful response from healthcare professionals who labeled it “just a dream.”³⁰

Think about that. The people best positioned to compare NDEs to dreams and hallucinations—because they have experienced both—are the very people telling us they are not the same thing. At what point do we start listening to the witnesses?

There is a helpful way to think about this. Suppose you had never tasted chocolate before, and someone described it to you as “a sweet, rich flavor.” You might reasonably compare that to other sweet, rich things you’ve tasted—caramel, maybe, or honey. But once you actually taste chocolate, you know immediately that it is its own thing. It’s not just a variation of caramel. It’s categorically different, and no amount of theoretical comparison between chocolate and caramel can change the fact that you know the difference because you have experienced it. NDErs who have also experienced vivid dreams, lucid dreams, and hallucinations are in exactly this position. They have tasted both, so to speak. And they are telling us, consistently and across every cultural and demographic boundary, that the NDE is not a variation of a dream. It is something else entirely.

Marsh’s dismissal of this testimony is all the more striking because he applies a double standard. When NDE experiencers report bizarre or seemingly dream-like content, Marsh takes their reports at face value and uses them as evidence that NDEs are brain-generated dreams. But when those same experiencers insist their experience was emphatically not a dream, Marsh dismisses their testimony as naive. You cannot have it both ways. Either experiencer reports are worth taking seriously, or they aren’t. If they are, then the overwhelmingly consistent testimony that NDEs are qualitatively different from dreams is powerful evidence. If they aren’t, then Marsh loses his own cherry-picked examples of dream-like NDE content.

4. The Coherence and Narrative Structure of NDEs Are Unlike Dreams

Marsh argues that NDEs are characterized by the same “bizarreness and illogicalities” as dreams.³¹ He spends considerable space in Chapter 4 of his book picking out odd, inconsistent, or seemingly silly elements from NDE narratives—a woman being led through a glass window by Jesus, another woman worried about her husband’s ironing—to argue that NDE content is dream-like in its strangeness. He concludes that anyone who thinks NDE narratives lack the bizarre quality of dreams “clearly cannot have read the appropriate accounts.”³²

But Marsh is cherry-picking. Yes, you can find occasional odd or seemingly trivial elements in NDE reports. You can find odd or seemingly trivial elements in reports of any real-life experience. If I asked ten people to describe the most significant event of their lives, at least a few of them would include some detail that sounds silly or incongruous out of context. That doesn’t mean their experiences were dreams.

The overwhelming pattern in NDE reports is actually the opposite of what Marsh claims. NDEs typically follow a coherent, recognizable structure: separation from the body, movement through a passage or tunnel, entry into a transcendent environment, encounter with deceased relatives or a being of light, a life review, a decision or instruction to return, and re-entry into the body. This structure repeats across thousands of cases, across cultures, across age groups, across religious and non-religious backgrounds.³³ Dreams, by contrast, are characterized by shifting settings, abrupt transitions, logical inconsistencies, and an overall fragmentation that is recognized as dreamlike precisely because it lacks this kind of coherent narrative arc.

Ian Wilson, a researcher who investigated the dream hypothesis, observed that most dreams involve disjointed or unreal elements and fade very quickly unless written down immediately. NDE accounts, by contrast, are consistently characterized by their total sense of reality and apparently effortless recall even years later.³⁴

Bruce Greyson’s long-term research confirms this. He has shown that NDE memories remain remarkably stable over periods of two decades or more—an extraordinary finding, since ordinary memories and dream memories tend to degrade, distort, and change over time. NDE memories do not behave like dream memories. They behave like memories of real events.³⁵

5. The Life-Transforming Effects of NDEs Are Unlike Anything Produced by Dreams

One of the most thoroughly documented facts about NDEs is their transformative power. People who have NDEs undergo profound, lasting changes in values, priorities, and behavior. They become less materialistic, more compassionate, less fearful of death, more spiritually oriented, and more focused on relationships and service to others. These changes persist for years and decades.³⁶ Pim van Lommel’s follow-up studies confirmed that these transformations remained strong at both two and eight years after the experience, and that cardiac arrest patients who had NDEs showed dramatically different life trajectories compared to a control group of cardiac arrest survivors who did not have NDEs.³⁷

Marsh himself acknowledges this. He admits that “most subjects are changed by their experience(s), becoming more tolerant towards society, people and family.”³⁸ But he argues that this transformation doesn’t prove the experience was “real.”

He’s partially right. Transformation alone doesn’t prove an experience was veridical. But ask yourself: when in the history of human experience has a dream produced this kind of lasting, across-the-board transformation in a person’s character, values, and worldview? We dream every night. Sometimes we have extremely vivid dreams. Sometimes those dreams are emotionally moving. But they do not, as a rule, produce permanent transformations of personality and behavior. Neither do hallucinations, drug experiences, or episodes of sleep paralysis. The transformative power of NDEs is not just slightly greater than the transformative power of dreams. It is categorically different.³⁹

As Miller observes, outside of the biblical record, never has a single dream had the kind of dramatic, lasting effect on a person’s life that a typical NDE has on the experiencer.⁴⁰ That fact is a serious problem for any theory that tries to reduce NDEs to dream states.

6. REM Intrusion During Cardiac Arrest Is Physiologically Implausible

Kevin Nelson’s REM intrusion hypothesis deserves special attention because it has received significant media coverage and is explicitly endorsed by Fischer and Mitchell-Yellin as a “promising” research program.⁴¹ Nelson argues that NDEs are caused by the dreaming brain erupting into waking consciousness through a breakdown in the brain’s state boundary controls.

There are multiple problems with this hypothesis. First, as Miller points out, Nelson’s much-publicized study of NDErs was based on only fifty-five subjects contacted through Jeffrey Long’s NDERF website—a modest sample, especially compared to the thousands of cases collected by Long, the three hundred studied by Fenwick, and the hundred-plus studied by Ring and Moody.⁴²

Second, and far more critically, the REM intrusion hypothesis faces an enormous physiological problem when applied to cardiac arrest NDEs. REM sleep is a highly active brain state. It requires functioning brainstem mechanisms, active cholinergic neurotransmission, and intact neural circuits connecting the brainstem to the cortex. During cardiac arrest, the brain loses its blood supply within seconds. EEG (electroencephalogram) readings go flat within ten to twenty seconds.⁴³ The brainstem centers that generate REM sleep require metabolic energy to function. When that energy supply is cut off, those centers shut down along with everything else.

To put it simply: you cannot have REM intrusion into consciousness when the brain has no blood flow. REM intrusion requires a functioning brainstem. A brain in cardiac arrest does not have a functioning brainstem. Nelson’s hypothesis might explain some NDE-like experiences that occur during near-death situations where the brain is stressed but still partially functional—fainting, for example, or the moments just before or after a cardiac event. But it cannot explain the subset of NDEs that occur during flat-line cardiac arrest, which is precisely the subset that includes the most impressive veridical cases.

Miller offers a devastating summary of Nelson’s shortcomings. If NDEs can be naturalistically explained as special dream states, he asks, then why do they differ so dramatically from dreams? Why do they consistently show narrative closure? Why do people born deaf report hearing, and people born blind report seeing? Why are the elements so consistent in a storyline that makes sense and has deep meaning for the experiencer? How do you explain the hundred-plus corroborated out-of-body experiences in the professional literature? How do you explain shared death experiences, where people who are neither depleted of oxygen nor in fear of their own death experience the same NDE simultaneously?⁶³ Nelson, Miller concludes, simply ignores all of this relevant data. He suggests naturalistic explanations for certain isolated elements of the experience and then assumes he has explained away all the evidence. But suggesting that a natural process can produce one feature of an NDE does not prove that it did produce that feature in any particular case—especially when other features of that same case cannot be explained by the same process.

There is yet another problem with Nelson’s REM intrusion model that deserves attention. Nelson’s own study found that NDErs were more likely to report certain sleep-related experiences (such as sleep paralysis and hypnagogic hallucinations) than non-NDErs.⁶⁴ He interprets this as evidence that NDErs have more permeable state boundaries, making them more susceptible to REM intrusion during crises. But this correlation could be interpreted in exactly the opposite direction. If consciousness can genuinely separate from the body (as the dualist holds), then individuals who are more “loosely tethered” to their physical bodies might naturally experience both more sleep-boundary anomalies and more NDEs—not because the NDEs are caused by the same brain mechanism as sleep paralysis, but because both phenomena reflect a looser-than-normal connection between consciousness and the body. Correlation, as we keep reminding the skeptics, is not causation. Nelson’s data is consistent with his hypothesis, but it is equally consistent with the alternative.

As Chris Carter notes in Science and the Near-Death Experience, Nelson’s argument also suffers from a basic confusion between the mechanism of a trigger and the mechanism of production. The locus coeruleus (a brainstem structure involved in the fight-or-flight response, which Nelson identifies as key to his model) is activated by physiological stress, including cardiac events. But activation of a stress response is not the same as production of a coherent, veridical, transformative conscious experience. The fact that a crisis triggers certain neural responses tells us nothing about whether those responses are sufficient to produce the full NDE, any more than the fact that switching on a radio activates its circuits tells us that the radio is composing the music.⁴⁴

7. NDEs in the Blind: The Dream Theory’s Achilles Heel

There is one more line of evidence that the dreaming hypothesis must confront, and it is perhaps the most difficult of all. Kenneth Ring and Sharon Cooper conducted a landmark study of NDEs in blind individuals, including people who were blind from birth. Their findings were remarkable: blind individuals reported detailed visual experiences during their NDEs, describing colors, shapes, and specific objects in their environment with an accuracy that was later confirmed.⁴⁵

Here’s why this matters for the dreaming argument. Research has consistently shown that people who are congenitally blind (blind from birth) do not have visual imagery in their dreams. They dream in sounds, textures, emotions, and smells—but not in pictures. People who lost their sight before age five also tend not to dream visually.⁴⁶ If NDEs were dreams produced by the brain, and if congenitally blind people do not dream in visual imagery, then congenitally blind NDErs should not report visual experiences. But they do. And what they report includes accurate perceptions of their physical environment.

This is a finding that the dreaming hypothesis simply cannot accommodate. If the brain cannot produce visual dream imagery for a congenitally blind person—because the visual cortex has never been trained by visual input—then a dream-based NDE should be non-visual for that person too. The fact that blind NDErs report rich visual experiences, including veridical ones, suggests that the source of the experience is not the dreaming brain but something else entirely.

8. Marsh’s Cortical Pathology Argument Cuts Both Ways

One of the more interesting sections in Marsh’s Chapter 7 draws on the work of neuropsychologist Mark Solms, who studied dreaming in patients with various kinds of brain damage. Solms found that specific cortical lesions—in the inferior parietal lobule or in deep frontal lobe structures—could entirely eliminate the ability to dream.⁴⁷ Damage to the medial occipito-temporal region could eliminate the visual content of dreams. Marsh uses this data to argue that dreaming is a cortically produced phenomenon, and he reasons that NDE imagery must therefore also be cortically produced.

But here’s where his argument undermines itself. If dreaming requires an intact, functioning cortex with specific regions operational—the inferior parietal lobule, the deep frontal structures, the medial occipito-temporal cortex—then what happens during cardiac arrest? All of these structures require blood flow and metabolic energy to function. During cardiac arrest, that supply is cut off. The cortex goes silent. The EEG goes flat. By Marsh’s own logic—by the very brain-scanning data and lesion studies he cites—a brain in cardiac arrest should be incapable of producing dream imagery.

And yet cardiac arrest NDEs are among the most vivid, most coherent, and most thoroughly documented of all NDEs. Marsh has essentially argued himself into a corner. Either the brain can produce complex, vivid imagery when its cortex is non-functional (which contradicts the dream research he cites), or the imagery is coming from somewhere other than the cortex (which undermines his entire thesis).⁴⁸

Marsh himself proposes that NDEs might be produced during the very brief window when the brain is “reawaking.”⁴⁹ He likens this to the hypnopompic state—the twilight zone of imagery that sometimes accompanies waking up. But this creates its own problem: a recovering brain should produce confusion, fragmentation, and disorientation. That’s what brain recovery looks like. It does not look like the hyperclarity, enhanced cognition, and veridical perception consistently reported in cardiac arrest NDEs. As we noted in the section on veridical cases (Chapter 4), a brain that is barely sputtering back to life is not a brain we would expect to perform better than a healthy waking brain at perceiving external events. Yet that is precisely what the veridical NDE evidence shows.

9. The Unified Nature of the NDE Experience

There is one more feature of NDEs that sets them apart from dreams, and it is often overlooked. Dreams are typically episodic and fragmented. They jump from scene to scene. They mix together unrelated people, places, and events. The narrative logic of dreams is notoriously loose—one moment you’re in your childhood home, the next you’re in a spaceship, and neither transition strikes you as strange (until you wake up).

NDEs, by contrast, are experienced as unified, meaningful wholes. The various elements—the out-of-body perception, the tunnel, the light, the encounter with deceased relatives, the life review, the decision to return—are experienced as parts of a single coherent journey.⁵⁰ NDErs don’t report the random scene-shifting that characterizes dreams. They report a structured progression with thematic unity and personal significance. Miller makes this point clearly: the NDE makes sense as a unified whole rather than consisting of random memories or random hallucinations, and it typically has closure rather than an abrupt, mid-sentence ending.⁵¹

This feature matters because the dreaming hypothesis would predict fragmentation, not unity. Dream mentation is produced by the interplay of brainstem and cortical activity with the prefrontal cortex (the brain’s “editor”) largely offline. The result is typically incoherent and bizarre. NDEs, by contrast, are experienced as the most coherent and meaningful experiences of the person’s life. Once again, the dreaming hypothesis predicts the wrong kind of experience.

There’s another angle here that deserves attention. Marsh himself notes, drawing on the Hobson dream model, that during REM sleep the cerebral cortex is “relegated to secondary player status since it is driven from below” and “attempts to make sense out of the impulses it receives.”⁶⁷ In other words, according to the dominant neuroscience model of dreaming, dreams are the cortex’s imperfect attempt to construct a narrative out of random brainstem signals. The result is characteristically messy: illogical jumps, impossible scenes, vanishing characters. That’s the hallmark of a cortex scrambling to impose order on chaotic input.

NDEs show the opposite pattern. The cortex during cardiac arrest is not receiving random brainstem signals—it is receiving no signals, because the brainstem itself is non-functional. And yet the resulting experience is more coherent, more structured, and more narratively unified than anything the dreaming brain produces on its best night. If dreaming is the cortex struggling to make sense of chaotic input, then an NDE during cardiac arrest—when there is no input at all—should produce not heightened coherence but nothing. The fact that it produces something, and that the something is extraordinarily coherent, is a datum that the dream model simply cannot absorb.

Raymond Moody, the physician who coined the term “near-death experience,” rejected the dream hypothesis early in the research for three reasons that remain compelling decades later. First, NDE accounts showed a striking similarity in content and progression that was unlike the random variability of dreams. Second, NDErs were psychologically normal people, not individuals prone to psychotic or delusional episodes. Third, the verifiable elements of NDEs had been independently corroborated—something that dreams, by their nature, never are.⁶⁸

D. Counter-Objections: Anticipating the Skeptic’s Pushback

“Maybe NDEs are an unknown type of dream that we haven’t discovered yet.”

A skeptic might respond to everything I’ve said by suggesting that NDEs are produced by some undiscovered dream mechanism—a special kind of crisis-dream that behaves differently from ordinary dreams, a type of mentation that our current neuroscience has not yet identified.

This is possible in theory. Anything is possible in theory. But this move comes at a significant cost. Once you abandon the known neurophysiology of dreaming—once you say, “NDEs aren’t like ordinary dreams, but maybe they’re like some other kind of dream that we haven’t identified yet”—you have essentially abandoned the very argument you started with. Marsh’s entire case is built on detailed parallels between NDEs and known dream states: REM sleep, hypnagogic states, centrifuge-induced dreamlets. If NDEs aren’t like any of these known states, then all those parallels are irrelevant. You’re no longer making a scientific argument grounded in neuroscience. You’re making an unfalsifiable appeal to an unknown mechanism.⁵²

An unknown mechanism that: (a) produces experiences that feel more real than waking life rather than less real, (b) generates veridical perception of real events in the external world, (c) works in cardiac arrest patients whose cortices are non-functional, (d) produces visual imagery in congenitally blind people who don’t dream visually, and (e) consistently triggers lasting personality transformation unlike anything produced by any known dream state. At what point does this “unknown dream mechanism” start looking an awful lot like consciousness operating independently of the brain?

“Vivid doesn’t mean veridical. Feeling real doesn’t make it real.”

Fischer and Mitchell-Yellin press this point, and it’s a fair one when considered in isolation.⁵³ Yes, it is logically possible for a very vivid, very realistic-feeling experience to be inaccurate. Hallucinations can be vivid. Psychotic episodes can feel desperately real to the person experiencing them. The mere feeling of reality is not, by itself, proof of reality.

But here is what Fischer and Mitchell-Yellin consistently fail to grapple with: nobody in the serious NDE literature is making the argument “It felt real, therefore it was real.” That would be a bad argument, and I would not make it. The argument is: “It felt real, and the independently verifiable elements turned out to be accurate.” The vividness of the experience is one piece of the puzzle. The veridical perception is another. The coherence is another. The blindsight cases are another. The life transformation is another. The consistency across cultures is another. Each piece alone might be explained away. Together, they form a cumulative case that the dreaming hypothesis cannot touch.⁵⁴

“Fischer and Mitchell-Yellin’s multi-factor explanation could eventually account for NDEs.”

In their Chapter 8, Fischer and Mitchell-Yellin argue that we should reject the demand for a “single factor” explanation of NDEs and allow for the possibility that multiple physical factors working together could explain the phenomena. They liken NDE skepticism about single-factor explanations to a fire investigator who wrongly insists that a house fire must have a single cause. Their point is that different features of NDEs might have different physical explanations—REM intrusion for the vivid imagery, hypoxia for the tunnel experience, endorphins for the sense of peace—and that the combination might account for the whole package.⁵⁵

This is an interesting philosophical move, but it faces the same empirical problem that every other skeptical explanation faces. You can combine as many physical factors as you like. You can invoke REM intrusion and hypoxia and endorphins and temporal lobe activity and cultural framing and confabulation. But no combination of these factors produces veridical perception of real events in the external world during documented cardiac arrest. No combination produces visual imagery in the congenitally blind. No combination explains how a patient with no heartbeat and no measurable brain activity can accurately report the contents of a specific drawer in a specific crash cart.⁵⁶

The multi-factor approach is clever in principle but empty in practice—not because multiple factors couldn’t be at work, but because the factors Fischer and Mitchell-Yellin invoke are the wrong kind of factors. They can explain subjective features of the experience (the feelings, the imagery, the sense of peace). They cannot explain the objective features (the veridical perceptions, the accurate real-time information, the confirmed details). And it is the objective features that constitute the real evidence for consciousness operating apart from the brain.

“We just need more research before concluding that NDEs are anything more than brain phenomena.”

This is the retreat to future science—the hope that eventually neuroscience will discover how the brain produces all these experiences. Fischer and Mitchell-Yellin make this move explicitly when they argue that our current inability to measure all brain activity doesn’t mean the brain isn’t active during NDEs; future technology might detect what we currently cannot.⁵⁷

I have two responses to this. First, you can say this about literally any phenomenon. “We don’t have a physical explanation yet, but future science might find one” is an unfalsifiable claim that can be applied to any evidence for any conclusion you want to avoid. It is not a scientific argument. It is a statement of faith—faith in the completeness of physicalism despite the current evidence pointing against it.

Second, this appeal to the future cuts both ways. Yes, future research might discover brain mechanisms we don’t currently know about. But future research might also strengthen the case for NDEs. Sam Parnia’s AWARE studies are specifically designed to test whether veridical OBE perceptions occur during documented cardiac arrest. If and when a patient accurately identifies a hidden target visible only from a position above the body during a period of confirmed flat-line brain activity, the “future science will explain it” response will be significantly harder to maintain.⁵⁸

The honest position is to evaluate the evidence we have now, not the evidence we hope to have someday. And the evidence we have now includes hundreds of verified cases, decades of consistent research, and a complete failure of every proposed neurological mechanism to account for the most evidentially significant features of NDEs. If the data were pointing the other way—if veridical cases were rare, inconsistent, and poorly documented—then the “wait for more research” response would be reasonable. But the data are pointing in one direction, consistently and with increasing strength. At some point, intellectual honesty requires us to follow the evidence rather than waiting indefinitely for it to change.

Conclusion: The Dream Is Over

The dreaming hypothesis is perhaps the most intuitively appealing of all the skeptical explanations for NDEs. We all dream, and the idea that a crisis-brain might produce an extraordinarily vivid dream is easy to understand. Marsh develops this idea with genuine neurological sophistication, and I respect the rigor he brings to the argument. Fischer and Mitchell-Yellin bring philosophical sharpness to the same theme. Nelson contributes neuroscience credentials and a specific mechanistic proposal. Together, they represent the best the skeptical side has to offer on this question.

But the hypothesis fails. It fails not because of any single argument, but because the full range of NDE evidence simply does not fit the dreaming model—not even close.

NDEs are described as more real than waking life, not less real like dreams. Dreams do not produce veridical perception of real events. People who have experienced both NDEs and vivid dreams insist they are fundamentally different. NDEs have a coherent narrative structure that dreams typically lack. The lasting transformative effects of NDEs are unmatched by any known dream state. REM intrusion is physiologically implausible during cardiac arrest. Blind people who do not dream visually report visual NDEs. And Marsh’s own cortical pathology data implies that the kind of brain activity needed for dreaming is precisely the kind that is absent during the cardiac arrest NDEs that produce the strongest veridical evidence.⁵⁹

I want to return, for a moment, to Marsh’s claim that NDErs simply don’t know enough about dreaming to recognize that their experience was a dream. I think this claim reveals something important—not about NDErs, but about the limits of Marsh’s own framework. Marsh is a brilliant neurologist. He knows the brain with extraordinary intimacy. He can describe the sleep cycle in exquisite detail. He can trace neurotransmitter pathways and map cortical activation patterns with the best of them. But knowing how the brain works during a dream is not the same thing as knowing whether every experience that resembles a dream actually is a dream. Marsh has the map, but he’s confused it with the territory. He assumes that because he can draw parallels between NDEs and brain-based dream states, NDEs must therefore be brain-based dream states. The parallels are real. The conclusion does not follow.

The philosopher Aldous Huxley once observed that the brain may function more as a reducing valve than as a producer of consciousness—filtering and narrowing the vast stream of awareness rather than generating it. William James, one of the greatest psychologists who ever lived, made the same argument. If they were right—if the brain is a filter rather than a factory—then of course we would expect brain states and conscious experiences to be correlated. Of course we would expect that disrupting the filter would change the experience. But the filter model also predicts that when the filter is dramatically weakened or temporarily removed (as in cardiac arrest), consciousness might actually expand rather than contract. It might become more vivid, more coherent, more real—not less. And that is exactly what NDErs consistently report.⁶⁵

For those of us who take Scripture seriously, there is an additional reason to resist the dreaming hypothesis. The Bible teaches that we are more than our bodies. The conscious intermediate state—the reality that human persons continue to exist, think, and experience after the death of the body—is taught in Luke 16:19–31, Philippians 1:21–23, 2 Corinthians 5:6–8, and Revelation 6:9–11, among other passages. If the soul survives bodily death, and if it is conscious between death and resurrection, then we would expect that some people who come very close to death—close enough for their brains to shut down temporarily—might catch a genuine glimpse of that post-mortem reality. We wouldn’t expect those glimpses to look like dreams. We would expect them to look like what NDErs actually report: a heightened consciousness, encounters with deceased loved ones who are fully real and fully present, and an encounter with a transcendent reality that makes ordinary waking life look dim by comparison.⁶⁶

The empirical evidence is primary. It stands on its own merits regardless of anyone’s theological commitments. But for those who have ears to hear, the evidence from near-death experiences and the testimony of Scripture are singing the same tune. We are not just brains. We are not just dreaming. And when the body fails, consciousness does not end. It goes somewhere. The skeptics have tried their best to stuff that reality back into the box of neuroscience, and I respect the attempt. But the box is too small. The evidence keeps spilling out.

In the next chapter, we turn to another popular skeptical explanation: the claim that NDEs are produced by ketamine and other drugs. The argument is different, but as we’ll see, the problem is the same. The skeptic can explain some features of some NDEs—but the veridical evidence, once again, refuses to cooperate.