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In page Chronobiology:

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Chronobiology studies variations of the timing and duration of biological activity in living organisms which occur for many essential biological processes. These occur in animals (eating, sleeping, mating, hibernating, migration, cellular regeneration, etc.), in plants (leaf movements, photosynthetic reactions, etc.), as well as in microbial organisms such as fungi and protozoa. They have also been found in bacteria, especially among the cyanobacteria (blue-green algae). The best studied rhythm in chronobiology is the circadian rhythm, a roughly 24-hour cycle shown by physiological processes in all these organisms. The term circadian comes from the Latin circa, meaning "around" and dies, "day", meaning "approximately a day." It is regulated by circadian clocks.[citation needed]