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  • Title: Sleep-wake habits of schoolchildren according to grade.
    Author: Shinkoda H, Matsumoto K, Park YM, Nagashima H.
    Journal: Psychiatry Clin Neurosci; 2000 Jun; 54(3):287-9. PubMed ID: 11186080.
    Abstract:
    Five hundred and twelve students aged from 6 to 18 years were administered the morningness-eveningness questionnaire and a sleep log. The mean morningness-eveningness score decreased with grade; this decrease was significant around the seventh grade. The habitual waking time showed no difference among grades but the habitual bedtime became later with grade; thus, the sleep length on weekdays decreased with grade. The percentage of students falling asleep during school lessons significantly increased from the eighth to 12th grade. We found that a delay of sleep phase, reduction of sleep length, increased daytime sleep, and transition to evening type occurred at around the seventh grade.
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