Your body runs on a 24-hour internal clock called the circadian rhythm, which regulates many crucial physiological processes in the body including your sleep and wake cycles, hormone production and metabolism. Your circadian rhythm keeps you alert and awake during the day, prepares your digestive system for food consumption, and allows your organs to rest and repair at night while you sleep.
Your internal clock or circadian rhythm consists of your brain clock located in the hypothalamus, which picks up external signals from your environment such as light, and your body clocks which are located in your tissues, fat cells, organs, muscles and gastrointestinal tract. Your body uses these external signals to let your internal clock know what time of day it is. The key signals which
