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https://www.circadiansleepdisorders.org/info/cycle_length.php
Length of Circadian Cycle in Humans. Quoted from Wikipedia (Circadian_rhythm - Humans): Early research into circadian rhythms suggested that most people preferred a day closer to 25 hours when isolated from external stimuli like daylight and timekeeping.
https://www.quora.com/Why-does-a-24-hour-circadian-rhythm-change-to-a-25-hour-if-you-spend-weeks-in-a-cave
25 hours isn’t really exact, but I’ll use that as an example. Our bodies evolved expecting that we would get that morning sunlight exposure to shorten our day. We get to 24 by combining the 25 hour starting day length and then modifying it by that shortening effect.
https://news.harvard.edu/gazette/story/1999/07/human-biological-clock-set-back-an-hour/
Jul 15, 1999 · internal clock period is actually closer to 25 hours; that is, the biological clock was thought to drift toward a 25-hour day unless it is set back an hour each day by exposure to morning light and to external clocks. This situation is blamed for a long list of sleep problems. Now, the most accurate measurements to date, made by researchers atEstimated Reading Time: 3 mins
https://pubs.niaaa.nih.gov/publications/arh25-2/85-93.htm
Circadian: A term derived from the Latin phrase “circa diem,” meaning “about a day”; refers to biological variations or rhythms with a cycle of approximately 24 hours. Circadian rhythms are self-sustaining (i.e., free running), meaning that they will persist when the organism is placed in an environment devoid of time cues, such as constant light or constant darkness.
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