Insomnia is defined by difficulties in falling or maintaining sleep despite having the adequate opportunity for sleep and is associated with various adverse complications. Although approximately 19% of adults meet the diagnostic criteria for insomnia, nearly 50% of these patients have chronic insomnia symptoms, the main manifestation being night-time complaints only. Epidemiologic studies have demonstrated that untreated insomnia is financially costly, with associated increased rates ofwork absenteeism, loss of workplace productivity, and work-related and motor vehicle accidents.
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