Youngstedt S.D., Goff E.E., Reynolds A.M., et al. Has adult sleep duration declined over the last 50+ years? Sleep Med Rev. 2016 Aug; 28: 69–85.
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Matricciani L., Olds T… Petkov J. In search of lost sleep: secular trends in the sleep time of school-aged children and adolescents. Sleep Med Rev. 2012 Jun; 16 (3): 203–11.
