We reviewed previous studies on childhood sleep and health in this paper. We focused on preschool children and the following four research areas: (1) change in sleep habits over 50 years in Japanese children and adequate sleep recommendations ; (2) multimedia use and home environments associated with sleep habits; (3) physical and/or psychological dysfunction caused by inadequate sleep; and (4) individual differences in morningness-eveningness (chronotypes). We emphasize the need for future

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... ies in younger children to examine the cause-effect relationship between sleep and health in the long term, using multiple informants and, from a child development point of view. keywords: sleep habits, adequate sleep, chronotype, home environment, physical and psychological dysfunctions (accepted for publication, 20th February 2015)-2-3-6, Minami, Wako, Saitama, 351-0197, Japan. T e l: 048-458-6148