Embedded within the genes of us, and almost all life on earth, are the instructions for a biological clock that marks the passage of around 24 hours. Biological clocks or “circadian clocks” help time our sleep patterns, alertness, mood, physical strength, blood pressure and much more.

Biological clocks set the pace for nearly all living things, and Jeffrey Hall, Michael Rosbash and Michael Young – awarded the Nobel Prize in Physiology or Medicine – helped us understand how.

Source: The ancient clock that rules our lives – TheConversation