Abendtyp

Abendtyp, in chronobiology, is a term used to describe a chronotype characterized by a preference for later wake and bedtimes and peak performance and alertness in the late afternoon or evening. People identified as Abendtyp typically report that mornings are difficult, they feel more energetic as the day progresses, and they may experience a sleep phase delayed relative to the societal norm.

In German-language literature, Abendtyp is contrasted with Morgenmensch (morning person) and with intermediäre chronotype between extremes. Chronotype can be assessed with instruments such as the Morningness-Eveningness Questionnaire (MEQ) developed by Horne and Ostberg, or the Munich Chronotype Questionnaire (MCTQ); these tools help estimate the degree of eveningness.

Typical characteristics include delayed sleep onset, a tendency to wake up later, preference for evening activities, and potential mismatch or social jet lag when work or school schedules require early rising. The Abendtyp may exhibit better performance or mood in the evening, though inconsistent findings exist and individual variation is large.

Age influences chronotype: eveningness is more common in adolescence and young adulthood and tends to decrease with age; environmental factors such as exposure to light, work schedules, and social obligations can shift or lock chronotypes. Flexible scheduling and later start times have been shown to reduce sleep debt and improve well-being for evening types.

See also Chronotype, Circadian rhythm, Social jet lag, Sleep timing, Horne-Ostberg Morningness-Eveningness Questionnaire, Munich Chronotype Questionnaire.