Prevalence of sleep disorders in the Los Angeles metropolitan area

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Abstract
The prevalence of sleep disorders was determined in a general human population through a survey of 1006 representative households in the Los Angeles metropolitan area. An overall prevalence of current or previous sleep disorders in adults of 52.1% was found: a 42.5% prevalence of insomnia, 11.2% of nightmares, 7.1% of excessive sleep, 5.3% of sleeptalking and 2.5% of sleepwalking. These conditions were often chronic and usually started early in life. Insomnia was more frequent in older people, particularly older women and in people of lower educational and socioeconomic status. Insomnia, nightmares and hypersomnia were correlated with more frequent general physical and mental health problems.

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