The Korean Journal of Health Psychology
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- KOREAN
- P-ISSN1229-070X
- E-ISSN2713-9581
- KCI
The Relation of Circadian Sleep Phase Preference to Sleep Habits, Psychological Adjustment and Academic Performance in College Students
Abstract
Sleep is one of the major factors affecting psychological adjustment and academic performance in college students. Sleep/wakefulness and other physiological functions such as body temperature, various hormonal levels show periodic fluctuations with a cycle of approximately 24 hours, so called 'circadian rhythms'. And, there are individual differences in the degree of coordination between the circadian sleep rhythm and the environmental clock. This circadian sleep phase preference is usually called "morningness(larks)/eveningness(owls)". The present study explored the relationship between circadian sleep phase preference and psychological/academic adjustment in college students. The 'morning type' group and 'evening type' group were defined by the top 5% and the bottom 5% on the "Composite scale of morningness"(Smith, Reilly & Midkiff, 1989), and the 2 groups were compared on the various adjustment measures of college life. The results showed that the evening type group's bedtime/wake-up time were significantly later than the moring type group's, and sleep latency was longer in the evening group while there was no difference in the sleep length between the two groups. And, the evening group showed impairment on sleep quality(Pittsburgh Sleep Quality Index), psychological adjustment (College Maladjustment Scale, Behavioral Health Questionnaire-20) and also on academic performance (Grade Point Average). The evening group's impairment was discussed in terms of the discrepancies between their circadian clock and social/environmental clock. It seems imperative to give relevant education on sleep hygiene to students from the beginning of college life and helpful personal guidances (such as special program on restructuring sleep habits) to students of extreme 'eveningness'.
- keywords
- Academic performance, Biological clock, Circadian sleep phase, Composite Scale of Morningness, Eveningness, Morningness, Sleep habit, Pittsburgh Sleep Quality Index, Psychological adjustment, Academic performance, Biological clock, Circadian sleep phase, Composite Scale of Morningness, Eveningness, Morningness, Sleep habit, Pittsburgh Sleep Quality Index, Psychological adjustment, 수면 일주기리듬, 아침/저녁 활동형, 적응, 생체시계, 수면습관, 피츠버그 수면질문지, 대학생활 부적응척도, 수면효율성
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