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 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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