circadian rhythm

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circadian rhythm:

see rhythm, biologicalrhythm, biological,
or biorhythm,
cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

[sər′kād·ē·ən ′rith·əm]
(physiology)
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
During the day your body is governed by ultradian rhythms which come round every 60-90 minutes.
Overlaying these circadian rhythms are biological functions that cycle over several hours, called ultradian rhythms.