The approximately 24-hour biological cycle that regulates sleep-wake patterns, hormone release, body temperature, and other physiological processes.
From Latin 'circa' (about) + 'dies' (day) + 'rhythm' from Greek 'rhythmos' (measured flow). About-a-day rhythm.
Your circadian rhythm is your body's internal clock — it runs on a roughly 24-hour cycle, telling you when to sleep, wake, eat, and be most alert.
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