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 …

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 sleep, …

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 …

Sep 2, 2025 · The circadian rhythm is 24 hours in the human body and is commonly referred to as the body ’s biological clock. One of the most essential and well-known circadian rhythms is the …

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