Our biological rhythms thrive on routine and the master clock located in the hypothalamus area of the brain responds to daylight exposure to keep us ticking on time.

Chronobiology investigates biological rhythms occurring in some prokaryotes and in all eukaryotes from fungi to humans.

Biological rhythms, including cycles related to sleep and wakefulness, mood, and cognitive performance, are synchronized with the body's internal circadian clock.

By regulating social rhythms, therapists hope to normalize in turn individuals' biological rhythms.

Under these circumstances, the circadian clock alone modulates the body's biological rhythms.