An in-depth look at how time shapes our lives and the universe around us. Your body, if you pay attention to the way it ticks, may be your best timekeeper.

Circadian Cycle — natural & internal process that regulates the sleep-wake cycle. 24 hours. As with plants, animals, fungi and cyanobacteria.
Even thought the circadian rhythms are endogenous, the local environment adjusts them by external cues – Zeitgeber.

Light — Temperature — Redox

Body clock.