Psychometric Properties of Questionnaires for Assessing Chronotype

The concept of chronotype refers to inter-individual differences for preferred time of day to be active or to sleep. Chronotype needs to be considered to lie on a continuum from extreme morning-types to extreme evening-types [1]. Morning-types (MT) go early to bed and wake up early, and perform at their best mental and physical performance in the early part of the day. In contrast, evening-types (ET) sleep and wake up late, and achieve their peak performance in the later of the day and evening hours. About 40% of adults fall in to one of the two extreme circadian types, whereas most people belong in the middle part of continuum [1]. Chronotype is also known as several different terminologies such as morningness-eveningness preference [2], circadian typology [3]. Chronotype can be measured by various self-administered questionnaires, which have been validated in many different languages. Accurate measurement is essential in all academic fields. The importance of developing appropriate self-report instruments meaREVIEW ARTICLE eISSN 2635-9162 / https://chronobiologyinmedicine.org Chronobiol Med 2020;2(1):16-20 / https://doi.org/10.33069/cim.2020.0003 CIM