One of two major subgroups of sleep disorders (parasomnias are the other major subgroup) in which the predominant disturbance is in the amount, quality, or timing of sleep. In dsm-iv-tr, this group includes primary insomnia, primary hypersomnia, narcolepsy, breathing-related sleep disorders, and circadian rhythm sleep disorders. Nocturnal myoclonus is classified as a sleep disorder not otherwise specified; it consists of repeated jerking of the limbs, particularly the legs, associated with brief periods of arousal.
A sleep disorder characterized by chronic sleeplessness when sleeping should occur.
Sleep disorders characterized by a disturbance in the amount, quality, or timing of sleep. They include primary insomnia, primary hypersomnia, narcolepsy, breathing-related sleep disorders, altitude insomnia, food allergy insomnia, environmental sleep disorder, and circadian rhythm sleep disorders.
A fundamental sleep disorder wherein the individual experiences disruptions in the amount, caliber, or timing of their sleep.