What is rapid eye movement (REM) sleep behavior disorder?
People with rapid eye movement (REM) sleep behavior disorder act out dramatic and/or violent dreams during REM sleep. REM sleep usually involves a state of sleep paralysis (atonia), but people with this condition move the body or limbs while dreaming.
Usually, it happens to men 50 and older, but it can happen to women and in younger people. It differs from sleepwalking and sleep terrors, in that the sleeper can be easily awakened and can recall vivid details of the dream.
From: Sleep Disorders and Parasomnias WebMD Medical Reference
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