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Abnormal physiological or psychological reactions associated with sleep or the transition between wakefulness and sleep, causing significant distress or impairment in social, occupational, or other important areas of functioning. In DSM-IV they form a subcategory of sleep disorders, including nightmare disorder, sleep terror disorder, and sleepwalking disorder. See also bruxism, central alveolar hypoventilation syndrome, central sleep apnoea, obstructive sleep apnoea, pavor diurnus, pavor nocturnus, sexsomnia, sleep apnoea. Compare dyssomnias. [From Greek para beside or beyond + somnus sleep]

Subjects: Psychology.

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