A broad category of sleep disorders characterized by either hypersomnolence or insomnia. The three major subcategories include intrinsic (i.e., arising from within the body) (SLEEP DISORDERS, INTRINSIC), extrinsic (secondary to environmental conditions or various pathologic conditions), and disturbances of circadian rhythm. (From Thorpy, Sleep Disorders Medicine, 1994, p187)

Synonyms: Sleep Disorder, Limit-Setting, Sleep Disorders, Limit-Setting, Limit Setting Sleep Disorder, Extrinsic Sleep Disorders, Environmental Sleep Disorder, Adjustment Sleep Disorders, Syndrome, Nocturnal Eating-Drinking, Eating-Drinking Syndromes, Nocturnal, Sleep Disorders, Adjustment, Nocturnal Eating-Drinking Syndromes, Sleep Disorders, Extrinsic, Dyssomnia, Sleep Disorder, Adjustment, Dyssomnias, Sleep Disorders, Environmental, Extrinsic Sleep Disorder, Sleep Disorder, Environmental, Sleep Disorder, Extrinsic, Environmental Sleep Disorders, Limit-Setting Sleep Disorder, Adjustment Sleep Disorder, Limit-Setting Sleep Disorders, Nocturnal Eating-Drinking Syndrome, Sleep Disorder, Limit Setting, Eating-Drinking Syndrome, Nocturnal, Nocturnal Eating Drinking Syndrome, Syndromes, Nocturnal Eating-Drinking