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 (i.e., …

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 when to …

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.

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 …

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. During …

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 influence your …

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 sleep …

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

Jul 27, 2025 · Our bodies operate on a natural, roughly 24-hour cycle known as the circadian rhythm. This fundamental biological process governs various physiological and behavioral changes in living …

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 most …