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  • A circadian rhythm is a roughly 24-hour cycle in the physiological processes of living beings, including plants, animals, fungi and cyanobacteria.
  • Circadian rhythms are endogenously generated, although they can be modulated by external cues such as sunlight and temperature.
  • Circadian rhythms are important in determining the sleeping and feeding patterns of all animals, including human beings.
  • the circadian rhythm most commonly determines the hours that a human being is asleep or awake during a day.
  • There are clear patterns of brain wave activity, metabolic rate, blood pressure hormone production, cell regeneration and other biological activities linked to this daily cycle.
  • Like a switch, light can turn off and turn on genes that control the molecular structure of biological clocks.
  • Circadian rhythms are synchronized with the earth’s rotation by daily adjustments in the timing of suprachiasmatic nucleus (SCN), following the exposure to light which indicates the time of the day.

References:

https://www.thehindu.com/opinion/op-ed/what-is-circadian-rhythm-in-biology/article26071724.ece