Sleep Quality as a Mediator Variable between Circadian Typology and Depression Level

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Korean Journal of Psychology: General

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Vol.29 No.2

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Sleep Quality as a Mediator Variable between Circadian Typology and Depression Level

Korean Journal of Psychology: General / Korean Journal of Psychology: General, (P)1229-067X; (E)2734-1127

2010, v.29 no.2, pp.355-370

& (2010). Sleep Quality as a Mediator Variable between Circadian Typology and Depression Level. Korean Journal of Psychology: General, 29(2), 355-370.

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Abstract

While humans’ sleep and wake episodes occur at about 24-hour cycle, there are individual differences in their preferences on bedtime, wake-up time and working hours, called ‘circadian type’. Morning-type and evening-type, the opposite extremes in the circadian typology, have been shown to differ not only in their preferred sleep patterns but also in some of their cognitive, behavioral and emotional aspects. Many studies have shown the correlation between evening type and depression. However, the causal relationship between the two has not been clarified. The present study aims to elucidate whether sleep quality mediates the relation between evening type and depression. Survey including the morningness-eveningness scale(the Korean version of Composite Scale of Morningness), depression scale(the Korean CES-D) and sleep quality measure(Pittsburgh Sleep Quality Index) was conducted to 899 Korean college students. Correlation analysis shows that the more the eveningness, the lower the sleep quality and the more depressed. Also, the lower the sleep quality, the more depressed. Structure equational modeling using AMOS shows that sleep quality fully mediates the relation between circadian typology and depression, and 40.2% of depression is explained by circadian typology and sleep quality. The present results suggest that improving sleep quality by sleep hygiene education can decrease the depression in evening type.

keywords: 일주기성 유형, 아침/저녁활동형, 우울 수준, 수면의 질, 매개효과, circadian typology, morning-evening type, depression level, sleep quality, mediating effect, circadian typology, morning-evening type, depression level, sleep quality, mediating effect

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Article Contents

Vol.29 No.2

Sleep Quality as a Mediator Variable between Circadian Typology and Depression Level

Abstract

Reference

Korean Journal of Psychology: General