REM sleep behavior disorder is a sleep disorder in which you appear to physically act out vivid, often unpleasant dreams with abnormal vocal sounds and movements during rapid eye movement (REM) sleep. You normally don't move during REM sleep, a normal stage of sleep that occurs many times during the night. You may have other sleep disorders with REM sleep behavior disorder. REM sleep behavior disorder often may be associated with other neurological conditions, including Lewy body dementia, Parkinson's disease and multiple system atrophy.

Nov. 20, 2012