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Dyssomnia refers to a classification of sleep disorders that have consistent features of difficulty getting to sleep or remaining asleep and/or excessive sleepiness. These disorders are characterized by altered amount of sleep, quality of sleep, and/or timing of sleep. Primary dyssomnias include insomnia and disorders of hypersomnia, as well as their respective subtypes. Sleep complaints, or disturbances, are common symptoms of a dyssomnia sleep disorder and are frequently observed as co-occurring in psychological disorders and psychopathology. In this entry, the dyssomnia classification is examined by major diagnostic types (insomnia and hypersomnia); epidemiology, common symptoms, diagnostic tests, and the common treatment approaches are discussed.

Insomnia

Insomnia is characterized by difficulty initiating sleep (sleep latency), maintaining sleep (wake after sleep onset), early morning awakenings, and/or perception of poor sleep ...

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