Epidemiology of sleep disorders
The prevalence of sleep disorders and complaints of poor sleep has been the subject of several studies. Surveys conducted in the US, European countries and Australia showed that between 30 and 40% of adults report sleep disturbances, or at least some degree of dissatisfaction with sleep, that occurred during the preceding year. For example, a study of 3,000 adults in the United States in 1985 found insomnia in 35% of cases, with 17% of the insomnias examined expressed or persistent (Mellinger et al., 1985). It is noted that 85% of people with severe, persistent insomnia did not receive any treatment.
The National Sleep Research Foundation of the United States and the Gallup Institute conducted a survey of 1,000 and 1,027 individuals in 1991 and 1995 to determine the frequency and nature of sleep disorders. The results of these surveys were, on the whole, comparable and contained a number of important and interesting observations. Like previous studies, surveys have shown that from one-third to one-half of the adult population, at least episodically, problems with sleep are noted. And 9-12% of respondents suffered from insomnia systematically or often. The 1995 survey also showed that adults with severe sleep disorders are less likely to assess their overall health.
Sleep Disorders - Epidemiology
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