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.
journal_name
Psychiatry Clin Neuroscijournal_title
Psychiatry and clinical neurosciencesauthors
Shinkoda H,Matsumoto K,Park YM,Nagashima Hdoi
10.1046/j.1440-1819.2000.00681.xsubject
Has Abstractpub_date
2000-06-01 00:00:00pages
287-9issue
3eissn
1323-1316issn
1440-1819journal_volume
54pub_type
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