Does the Arousal System Contribute to Near-Death and Out-of-Body Experiences? A Summary and Response

When a 2006 paper in the journal Neurology claimed that near-death experiences are basically just dreams leaking into waking life — a phenomenon called REM intrusion, where dream-state brain activity pops up when you're awake — it became one of the most cited scientific explanations for NDEs. Jeffrey Long and Janice Holden wrote this thorough 35-page takedown showing the explanation doesn't hold up. Their critique lands eight solid punches. First, 40% of people who had NDEs never experienced anything resembling REM intrusion at all. The survey questions were flawed — a 'yes' answer might reflect changes that happened after the NDE, not some pre-existing brain quirk. The comparison group was made up of medical professionals who likely underreported their own dream-like experiences because they knew it could sound pathological, and they weren't even matched for having faced life-threatening situations. Perhaps most damaging: NDEs happen under conditions where REM activity is actually suppressed, like during general anesthesia or barbiturate overdose. And the experiences themselves look nothing like REM dreams — NDEs feature coherent stories, deep peace, and sometimes verifiable perceptions of real events, while REM intrusions tend to be brief, frightening, and bizarre. People who had NDEs consistently described them as feeling 'more real than real,' which is the opposite of dreamy, and NDERF survey data showed virtually no NDErs reported any subsequent experience (including REM intrusion) that reproduced their NDE. NDEs also share a remarkably consistent structure across cultures, while ordinary dreams do not. This paper set a high bar for anyone trying to explain away NDEs with simple brain-based theories.