Hi Draoi, seems that you don't agree to any at all! I, too, am a skeptic on this matter at first. Not till I began experiencing them. Below is one of my researches on the net about a study on the comparison of the two, by Dr. Stephen LaBerge. Kinda long... but helpful.
OUT-OF-BODY EXPERIENCES AND LUCID DREAMS
by Lynne Levitan and Stephen LaBerge, Ph.D.
"Out of body" experiences (OBEs) are personal experiences
during which people feel as if they are perceiving the physical
world from a location outside of their physical bodies. At least
5 and perhaps as many as 35 of every 100 people have had an OBE
at least once in their lives (Blackmore, 1982). OBEs are highly
arousing; they can be either deeply disturbing or profoundly
moving. Understanding the nature of this widespread and potent
experience would no doubt help us better understand the
experience of being alive and human.
The simplest explanation is that OBEs are exactly what they
seem: the human consciousness separating from the human body and
traveling in a discorporate form in the physical world. Another
idea is that they are hallucinations, but this requires an
explanation of why so many people have the same delusion. Some of
our experiments have led us to consider the OBE as a natural
phenomenon arising out of normal brain processes. Thus, we
believe that the OBE is a mental event that happens to healthy
people. In support of this, psychologists Gabbard and Twemlow
(1984) have concluded from surveys and psychological tests that
the typical OBE experient is "a close approximation of the
'average healthy American.'" (p. 40)
Our conception, also proposed by the English psychologist
Susan Blackmore, is that an OBE begins when a person loses
contact with sensory input from the body while remaining
conscious (Blackmore, 1988; LaBerge - Lucidity Letter; Levitan -
Lucidity Letter). The person retains the feeling of having a
body, but that feeling is no longer derived from data provided by
the senses. The "out-of-body" person also perceives a world that
resembles the world he or she generally inhabits while awake, but
this perception does not come from the senses either. The vivid
body and world of the OBE is made possible by our brain's
marvelous ability to create fully convincing images of the world,
even in the absence of sensory information. This process is
witnessed by each of us every night in our dreams. Indeed, all
dreams could be called OBEs in that in them we experience events
and places quite apart from the real location and activity of our
bodies.
WHAT ARE OBES LIKE?
So, we are saying that OBEs may be a kind of dream. But, even
so, they are extraordinary experiences. The great majority of
people who have had OBEs say they are more real than dreams.
Common aspects of the experience include being in an "out-of-
body" body much like the physical one, feeling a sense of energy,
feeling vibrations, and hearing strange loud noises (Gabbard &
Twemlow, 1984). Sometimes a sensation of bodily paralysis
precedes the OBE (Salley, 1982; Irwin, 1988; Muldoon &
Carrington, 1974; Fox, 1962).
To the sleep researcher, these strange phenomena are
remarkably reminiscent of another curious experience, called
sleep paralysis. Sleep paralysis occurs sometimes when a person
is waking from or falling into REM sleep, the state in which most
vivid dreams occur. During REM sleep, the muscles of the body,
excluding the eye muscles and those responsible for circulation
and respiration, are immobilized by orders from a nerve center in
the lower brain. This prevents us from acting out our dreams.
Occasionally, this paralysis turns on or remains active while the
person's mind is fully awake and aware of the world.
Some of the experiences people have reported during sleep
paralysis are: "I feel completely removed from myself," "feeling
of being separated from my body," "eerie, rushing experiences,"
and hearing "hissing in the ears," and "roaring in the head."
These events appear to be much like the OBE sensations of
vibrations, strange noises, and drifting away from the physical
body (Everett, 1983). Fear has also been described as a common
component of sleep paralysis (see the "Question and Answer" in
NightLight, Vol. 2, No. 1 for a discussion of overcoming fear in
sleep paralysis.)
WHEN DO OBES HAPPEN?
So, it seems possible that at least some OBEs arise from the
same conditions as sleep paralysis, and that these two terms may
actually be naming two aspects of the same phenomenon. As a first
test of this idea, we should ask how many OBEs actually occur at
times when people are likely to experience sleep paralysis --
that is, do OBEs happen when people are lying down, asleep,
resting, or while awake and active?
Researchers have approached the question of the timing of
OBEs by asking people who claim to have had OBEs to describe when
they happened. In one of these, over 85 percent of those surveyed
said they had had OBEs while they were resting, sleeping or
dreaming. (Blackmore, 1984) Other surveys also show that the
majority of OBEs occur when people are in bed, ill, or resting,
with a smaller percentage coming while the person is drugged or
medicated. (Green, 1968; Poynton, 1975; Blackmore, 1983 )
Survey evidence favors the theory that OBEs could arise out
of the same conditions as sleep paralysis. There is also
considerable evidence that people who tend to have OBEs also tend
to have lucid dreams, flying and falling dreams, and the ability
to control their dreams (Blackmore, 1983, 1984; Glicksohn, 1989;
Irwin, 1988).
Because of the strong connection between OBEs and lucid
dreaming, some researchers in the area have suggested that OBEs
are a type of lucid dream (Faraday, 1976; Honegger, 1979; Salley,
1982). One problem with this argument is that although people who
have OBEs are also likely to have lucid dreams, OBEs are far less
frequent, and can happen to people who have never had lucid
dreams. Furthermore, OBEs are quite plainly different from lucid
dreams in that during a typical OBE the experient is convinced
that the OBE is a real event happening in the physical world and
not a dream, unlike a lucid dream, in which by definition the
dreamer is certain that the event is a dream. There is an
exception that connects the two experiences -- when we feel
ourselves leaving the body, but also know that we are dreaming.
In our studies of the physiology of the initiation of
lucidity in the dream state, we observed that quite of few of the
lucid dreams we collected contained experiences like OBEs. The
dreamers described lying in bed, feeling strange bodily
sensations, often vibrations, hearing loud humming noises, and
then rising out of body and floating above the bed.
Those studies revealed that lucid dreams have two ways of
starting. In the much more common variety, the "dream-initiated
lucid dream" (DILD), the dreamer acquires awareness of being in a
dream while fully involved in it. DILDs occur when dreamers are
right in the middle of REM sleep, showing lots of the
characteristic rapid eye movements. We know this is true because
our dreamers give a deliberate prearranged eye-movement signal
when they realize they are dreaming. These signals show up on our
physiology record, so that we can pinpoint the times when
lucidity begins and see what kind of brain state the dreamers
were in at those times. DILDs account for about four out of every
five lucid dreams that our dreamers have had in the laboratory.
In the other 20 percent, the dreamers report awakening
from a dream and then returning to the dream state with unbroken
awareness -- one moment they are aware that they are awake in bed
in the sleep laboratory, and the next moment, they are aware that
they have entered a dream and are no longer perceiving the room
around them. We call these "wake initiated lucid dreams" (WILDs).
A casual look at the dream reports and physiological
records led us to think that the OBE-type dream content was
happening mostly in WILDs. So, we analyzed the data
scientifically in the experiment described below.
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