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Does anybody have a theory why this change happens to teenagers? Everything I have read agrees it does happen, but nobody seems to suggest a reason why this has evolved.

Biology’s cruel joke goes something like this: As a teenage body goes through puberty, its circadian rhythm essentially shifts three hours backward. Suddenly, going to bed at nine or ten o’clock at night isn’t just a drag, but close to a biological impossibility. Studies of teenagers around the globe have found that adolescent brains do not start releasing melatonin until around eleven o’clock at night and keep pumping out the hormone well past sunrise.

https://www.brainpickings.org/2013/07/17/sleep-and-the-teenage-brain/

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