RBD is characterized by the emergence of prominent motor activity from sleep, associated with dream content (Schenck and Mahowald, 1990). The motor activity is often violent including punching, kicking, or running from bed with resultant injury to the patient or bed partner. The individual usually is acting out his or her dreams or nightmares. The PSG may demonstrate the presence of augmented electromyographic (EMG) tone during REM sleep. The motor phenomena such as kicking or punching activity, if recorded, occur during the REM state.
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