A circadian rhythm (/ sərˈkeɪdiən /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism …

Mar 15, 2024 · Your circadian rhythm is the pattern your body follows based on a 24-hour day — it’s the name given to your body’s internal clock. This rhythm tells your body when to sleep and …

Jul 23, 2025 · Your circadian rhythm is your body’s internal clock, helping regulate sleep, wakefulness, hormone release, and other biological processes over a 24-hour cycle.

Jan 22, 2025 · Your circadian rhythm is your body’s internal clock. Light, sleep patterns, hormones, meals, and temperature can all influence your circadian rhythm, which in turn can …

May 20, 2025 · Most living things have circadian rhythms, including animals, plants, and microorganisms. In humans, nearly every tissue and organ has its own circadian rhythm, and …

Dec 5, 2016 · Most often, it's seen and heard in the term circadian rhythm, which refers to the inherent cycle of about 24 hours that appears to control various biological processes, such as …

Nov 19, 2025 · circadian rhythm, the cyclical 24-hour period of human biological activity. Within the circadian (24-hour) cycle, a person usually sleeps approximately 8 hours and is awake 16. …

Apr 21, 2025 · Circadian rhythms have been found in nearly every form of life, from single-celled cyanobacteria to humans. They likely evolved billions of years ago in response to the planet’s …

Dec 17, 2025 · Ever get a "second wind" at night? Learn about your circadian rhythm and,the body's master clock controlling your circadian rhythm. Learn how light and routine can impact …

Learn sleep & circadian basics and get familiar with the master clock that controls sleep and circadian rhythms throughout the day.