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Health, Explained · 45 sec

Circadian rhythm

Understand the mechanism before acting on health claims.

  1. The useful idea

    A circadian rhythm (), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.

  2. How it works

    Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).

  3. Why it matters

    Circadian rhythms are regulated by a circadian clock whose primary function is to rhythmically co-ordinate biological processes so they occur at the correct time to maximize the fitness of an individual.

Use Circadian rhythm to ask clearer questions; personal health decisions still belong with a qualified professional.

Use Circadian rhythm to ask clearer questions; personal health decisions still belong with a qualified professional.

Test your recall

Which idea belongs to the explanation of Circadian rhythm?

  • How it works
  • The useful idea — correct
  • Why it matters

A circadian rhythm (), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.

EvergreenLast verified 2026-07-19

General education only — not medical advice, diagnosis, or treatment.

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