How Your Body Clock Knows When It Is Night

Place a person in a quiet room with no clock, and the body does not lose all sense of time. Temperature rises and falls. Hormones change. Inside this episode: - A Rhythm Close To One Day - The Master Clock - Light Takes A Special Route - Melatonin Is A Time Signal - Clocks Throughout The Body Sources include the references linked below. Sources and further reading: - [NHLBI, Your Sleep and Wake Cycle](https://www.nhlbi.nih.gov/health/sleep/sleep-wake-cycle) - [NIGMS, Circadian Rhythms](https://www.nigms.nih.gov/education/fact-sheets/Pages/circadian-rhythms) This episode provides general education about sleep and the body. It is not medical advice, diagnosis, treatment, or an assessment of any listener. Follow Sleep Science Explained for another clear look at what happens after you close your eyes.