The scientific study of biological processes and rhythms that occur over time, such as circadian rhythms and seasonal cycles in living organisms.
Combining 'chron' (time), 'bio-' (life), and '-logy' (study of). This field emerged in the 20th century as scientists recognized that organisms have internal time-dependent cycles.
Chronobiology revealed that your body is running on multiple hidden clocks—your circadian rhythm, your monthly cycles, your yearly patterns—which is why jet lag hits so hard and why your grandmother's advice about sleep schedules was actually grounded in deep biology.
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