+The **Body Clock** is an organism's intrinsic, internal timekeeping system. This [Biological Rhythm](/wiki/biological_rhythm), primarily a [Circadian Rhythm](/wiki/circadian_rhythm), regulates fundamental processes like sleep, wakefulness, and metabolism over a roughly 24-hour cycle.
+## See also
+- [Sleep](/wiki/sleep)
+- [Jet Lag](/wiki/jet_lag)
+- [Chronobiology](/wiki/chronobiology)
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