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Usage of Mobile Phone in The Evening or at Night Makes Japanese Students Evening-typed and Night Sleep Uncomfortable
Tetsuo Harada D.S, Mami Morikuni B.E, Sato Yoshii B.E, Yasuhiro Yamashita B.A, Hitomi Takeuchi M.E,
24 hours society is rapidly advancing in JAPAN: convenience stores and so-called “Family-
Restaurant”, broad-casting radio and TV programs, and Internet programs, all of which
we can enjoy 24-hours. Mobile phone is very convenient equipment for communication
anywhere and anytime and now rapidly distributed not only to university students but also
to young students in Japan. An epidemiological work was done on the effects of mobile
phone usage by Japanese junior high school students (aged 13-15y), and university and
physical therapist or nurse training school students (aged 18-25y) on morningnesseveningness
preference and sleep habit. Everyday usage of mobile phone made the
younger students more evening-typed, their wake-up timing delayed and their sleep hours
shorter. Usage of mobile phone more than 20 min. per once usage made the elder
students more evening-typed, their sleep latency longer, and them feel difficult to fall in
sleep more frequently. Shifting to evening-typed partially caused by the usage of mobile
phone can be possible to make psychiatry problems on the students which are supposed
to be caused by internal de-synchronization of two circadian oscillators in humans. Usual
usage of mobile phone in the evening or night might become effective “Electromagnetic
and/or Psychological Zeitgeber(s)” for circadian oscillator driving sleep-wake cycle of
Japanese students from chronobiological point of view. (Sleep and Hypnosis
2002;4(4):149-153)
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