+Chronobiology explores life's internal clocks, the [biological rhythms](/wiki/biological_rhythms) that shape nearly all living things. It studies how these cycles, like the daily [circadian rhythm](/wiki/circadian_rhythm), synchronize organisms with the Earth's passage of time.
+## See also
+- [Sleep](/wiki/sleep)
+- [Day-night cycle](/wiki/day-night_cycle)
+- [Melatonin](/wiki/melatonin)
... 1 more lines