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 …

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 · Circadian rhythms affect many bodily processes, your mental state, and your behavior. Perhaps the most well-known circadian rhythm is the sleep-wake cycle, which …

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 …

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 …

Jan 10, 2026 · 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. …

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 …

Jan 13, 2026 · What is the Circadian Rhythm? The circadian rhythm is a natural 24-hour cycle that regulates when your body feels awake, sleepy, hungry, alert, or relaxed.

6 days ago · Your circadian rhythm is an internal 24-hour clock that controls your sleep-wake cycle, influenced by cues like sunlight and activity. To align your sleep with this rhythm, get …

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