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Definition

Circadian rhythms

Circadian rhythms (from the Latin circa diem, or “around the day”) are biological processes that occur regularly on approximately a 24-hour cycle. Sleeping and waking, for instance, occur naturally to the beat of an internal pacemaker that works on a cycle of about 24 hours. Several other bodily functions, such as body temperature, hormone production and blood pressure, also follow circadian rhythms.

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