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KMID : 0389520190260010005
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Sleep Medicine.Psychophysiology
2019 Volume.26 No. 1 p.5 ~ p.15
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Assessment and Understanding of Chronotype
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Kim So-Min
Kim Seog-Ju
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Abstract
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Chronotype (CT) is defined as an inter-individual difference in sleep-wake cycles and daily activities. Previous studies have suggested that this individual difference can influence our biological and psychological functioning. Literature regarding the psychometric properties and validity of CT measures are reviewed. We provide an overview of biological indicators (sleep-wake cycle, body temperature, cortisol, and melatonin) that are used for distinguishing two chronotypes: morningness (MT) and eveningness (ET). We also review the differences between CT in relation to personality traits and the occurrence of psychopathology. In addition, the methodological limitations of studies on CT are discussed. Finally, future research directions in terms of CT are proposed.
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KEYWORD
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Chronotype, Circadian typology, Eveningness, Morningness
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