sleep terror disorder
a sleep disorder characterized by repeated episodes of abrupt awakening from NREM sleep accompanied by signs of disorientation, extreme panic, and intense anxiety. More intense than nightmares and occurring during the first few hours of sleep, these episodes typically last between 1 and 10 minutes and involve screaming and symptoms of autonomic arousal, such as profuse perspiration, dilated pupils, rapid breathing, and a rapidly beating heart. The individual is difficult to wake or comfort and does not have detailed recall of the dream upon waking; complete loss of memory for the episode is common. The disorder occurs most often in children and generally resolves itself during adolescence. In adults, it is often associated with psychopathology and a more chronic course. Also called night terror. See also parasomnia.