Washington D.C. [USA], June 29 : A recent study conducted in approx 35 countries suggests that mystical near-death experiences in which people report a range of spiritual and physical symptoms, including out-of-body sensations, seeing or hearing hallucinations, racing thoughts and time distortion, affect around 10 per cent of people.
These near-death experiences (NDEs) are equally as common in people who are not in imminent danger of death as in those who have experienced truly life-threatening situations such as heart attacks, car crashes, near drowning or combat situations.
Experiences most frequently reported by participants in their study included abnormal time perception (87 per cent), exceptional speed of thought (65 per cent), exceptionally vivid senses (63 per cent) and feeling separated from, or out of their body (53 per cent).
The study group who reported NDEs variously described feeling at total peace, having their 'soul sucked out', hearing angels singing, being aware they were outside their body, seeing their life flashing before them, and being in a dark tunnel before reaching a bright light. Others spoke of being aware of another's presence before they went to sleep, or of a demon sitting on their chest while they lay paralysed unable to move.
The team recruited 1,034 lay people from 35 countries via a crowdsourcing platform online and asked them if they'd ever had an NDE. If they answered 'yes', they were asked for more details, using a detailed questionnaire assessment tool called the Greyson Near-Death Experience Scale, which asks about 16 specific symptoms, reported a study discussed in the meeting of European Academy of Neurology.
A total of 289 people reported an NDE, and 106 of those reached a threshold of 7 on the Greyson NDE Scale, (which confirms a true NDE). Some 55 per cent perceived the NDE as truly life-threatening and 45 per cent as not truly life-threatening.
Far from being a pleasant experience associated with feelings of peacefulness and wellbeing, as some previous studies have reported, the new study found a much higher rate of people reporting their NDE as unpleasant. Overall, of all the people who claimed an NDE, 73 per cent said it was unpleasant and only 27 per cent said it was pleasant. However, in those with a score of 7 or above on the Greyson NDE Scale (a confirmed NDE), this changed to 53 per cent reporting a pleasant experience and 14 per cent an unpleasant one.
Based on insight gained from previous studies, the researchers found an association between NDEs and Rapid Eye Movement (REM) sleep intrusion into wakefulness. REM sleep is a phase of the sleep cycle where the eyes move rapidly, the brain is as active as when someone is awake, dreaming is more vivid, and most people experience a state of temporary paralysis, as the brain sends a signal to the spinal cord to stop the arms and legs moving. When REM sleep intrudes into wakefulness, some people report visual and auditory hallucinations and other symptoms such as sleep paralysis, where they feel conscious but cannot move.
REM sleep intrusion on wakefulness was found to be more common in people with scores of 7 or above on the Greyson NDE Scale (47 per cent) than in people with scores of 6 or below (26 per cent), or in those below the threshold with no such experiences (14 per cent).
Lead researcher Dr Daniel Kondziella, said, "Our central finding is that we confirmed the association of near-death experiences with REM sleep intrusion. Although the association is not causality, identifying the physiological mechanisms behind REM sleep intrusion into wakefulness might advance our understanding of near-death experiences."