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Define nightowl12/8/2023 ![]() ![]() and rises at 7 the midpoint of sleep is 4 a.m. A person who goes to bed at midnight and rises at 8 thus has the same chronotype as a person who goes to bed at 1 a.m. Īs circadian rhythm is independent of the number of hours of sleep a person needs, Roenneberg calculates the rhythm based on the midpoint of the sleep period. According to Roenneberg, the distribution of circadian rhythms spans from the very early to the very late chronotypes, similarly to how height varies from short to tall. Biological processes, including sleep-wake patterns, that display an oscillation of about 24 hours are called circadian rhythms. Till Roenneberg, a chronobiologist in Munich, has mapped the circadian rhythms of more than 200,000 people. Researchers have traditionally used the terms morningness and eveningness to describe these two chronotypes. A person called a night owl is someone who usually stays up late and may feel most awake in the evening and at night. The opposite of the lark is the owl, often awake at night. They are thus well-suited for working the day shift. (or earlier), and tend to feel most energetic just after they get up in the morning. ![]() Human "larks" may sleep from around 10 p.m. The term relates to the birds known as larks, which are known to sing before dawn. Morning larks may be employed as baristas in coffee shops.Ī lark, early bird, morning person, or (in Scandinavian countries) an A-person, is a person who usually gets up early in the morning and goes to bed early in the evening. For personality type, see Type a personality. ![]()
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