Abstract
To date, only limited epidemiological data on the sleep habits of young children in Japan have been available. This study used representative samples to examine the sleep habits of four-and-a-half-year-old children in Japan. We used data from a nationwide cross-sectional survey. A member of each subject's family was asked to complete the questionnaire. The questionnaire included personal characteristics, sleep habits, and lifestyle. The data for 39,813 subject children (collection rate: 74.3%) were analyzed. The mean value of total sleep duration, night-time sleep duration, and daytime napping duration was 10 h 40 min 30 s, 9 h 53 min 0 s, and 46 min 24 s, respectively. The prevalence of daytime napping was 45.8%. Those whose total sleep duration was less than 10h accounted for 13.7% of the sample. The factors associated with high odds ratios for shorter total sleep duration were: living in a less populated area, long hours spent watching television, longer maternal work hours, and attending preschool. In attempting to devise ways of improving the sleep habits of young children, the lifestyles of both the children and their parents must be considered.
Published Version
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