+A biological rhythm is an intrinsic, cyclical variation in living organisms. These endogenous patterns, such as the daily [Circadian Rhythm](/wiki/circadian_rhythm), govern vital processes from sleep-wake cycles to hormone release, often synchronized by environmental cues like [Light](/wiki/light).
+## See also
+- [Sleep](/wiki/sleep)
+- [Chronobiology](/wiki/chronobiology)
+- [Homeostasis](/wiki/homeostasis)
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