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Sleep–wake habits of schoolchildren according to grade
Author(s) -
Shinkoda Harumi,
Matsumoto Kazuya,
Park Young Man,
Nagashima Hidetoshi
Publication year - 2000
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1046/j.1440-1819.2000.00681.x
Subject(s) - bedtime , evening , sleep (system call) , psychology , chronotype , audiology , medicine , demography , morning , psychiatry , physics , astronomy , sociology , computer science , operating system
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.