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Background
Preschool children in Asian countries, including Japan, sleep for a shorter duration at night than those in Europe and the USA. We examined the effects of the nighttime sleep duration on behavioral development in early childhood in Japan.
Methods
We used data from a large Japanese nationwide, population‐based, longitudinal survey that began in 2001. We restricted the study participants...
To investigate the associations between sleep duration and mortality in the elderly by controlling for sleep quality.Data were collected from participants in a cohort study in Shizuoka, Japan. A total of 14,001 elderly residents (aged 65–85 years), randomly chosen from all 74 municipalities in the prefecture, completed questionnaires that evaluated sleep duration, sleep complaints, and the use of...
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