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Body clock (circadian rhythms)

Circadian rhythms, or 24-hour cycles, are driven by the body's "biological clock." The biological clock is regulated by light or darkness, which can make the body think it is time to sleep or wake up.

The 24-hour circadian rhythm controls functions such as:

  • Sleeping and waking.
  • Body temperature.
  • The balance of body fluids.
  • The way other body systems function.