Sleep paralysis is a condition characterized by temporary paralysis of the body shortly after waking up (known as hypnopompic paralysis) or, less often, shortly before falling asleep (known as hypnagogic paralysis).
Physiologically, it is closely related to the normal paralysis that occurs during REM (rapid eye movement) sleep, also known as REM atonia. Sleep paralysis occurs when the brain is awakened from an REM state into essentially a normal fully awake state, but the bodily paralysis is still occurring. This causes the person to be fully aware, but unable to move. In addition, this state may be accompanied by hypnagogic hallucinations.
More on [ Sleep paralysis ]

Sleep paralysis - A thread dealing with sleep paralysis (1995-1997).
Sleep Paralysis and Related Experiences - A comprehensive site dealing with sleep paralysis, hypnagogic and hypnopompic hallucinations.
The Periodic Paralysis Resource Center - This site provides information on sleep paralysis as well as daytime paralysis.
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