Children with sleep disorders typically have a busy schedule involving cram school, after-school lessons and club activities. They also use electronic devices, such as smartphones and computers.

Toshimasa Obonai, director of the department of pediatrics sleep disorder clinic at the Tokyo Metropolitan Tama-Hokubu Medical Center in Higashimurayama. More than half of school-age children are sleep-deprived, a large-scale survey conducted jointly by the University of Tokyo and Riken, National Research and Development Institute has revealed.

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