Abstract:Background: Sleep deprivation is often claimed to be increasingly common, but most studies show small changes in sleep duration over the last decades. Our aim was to analyze long-term patterns in self-reported sleep duration in a population-based cohort. Methods: Members of the Older Finnish Twin Cohort have responded to questionnaires in 1975 (N = 30,915 individuals, response rate 89%, mean age 36 years), 1981 (24,506, 84%, 41 years), 1990 (12,502, 77%, 44 years), and 2011 (8510, 72%, 60 years). Weibull regre… Show more
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