For nearly 300 years, investigators have known that body temperature follows a circadian, or 24-hour, rhythm, with a peak during the day and a low at night. The benefit of this control during evolution may have been to allow conservation of energy while sleeping because keeping body temperature above the surrounding temperature requires heat production from metabolic processes inside the body. But, it is also critical to be able to adapt to changes in ambient temperature, regardless of the time of day.
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