PARASOMNIAS WITH REM SLEEP (DREAM SLEEP)
Nightmares are disturbing mental experiences that generally occur during the last third of the night when REM sleep is plentiful. Dream recall is usually vivid and detailed. Most adults will experience nightmares occasionally, but if these occur frequently and cause chronic daytime sleepiness, an evaluation of the problem is needed.

Sleep paralysis is the inability to perform voluntary movements either at sleep onset or upon awakening. Paralysis usually lasts only a few minutes and disappears spontaneously or by external stimulation.

REM Sleep Behavior Disorder (RBD)
Patients with RBD have muscle activity during dream sleep which permits the "acting out" of a dream. This causes very intense and vigorous sleep behaviors accompanied by vivid dreams. Most patients with RBD complain of sleep injury but rarely of sleep disruption. RBD is most common in men over 50 years old with an underlying neurological disorder such as dimentia, Parkinson's, narcolepsy or a stroke.