A circadian rhythm is an internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours. It’s sometimes referred to as the body’s “biological clock.” This rhythm is influenced by external cues such as sunlight and temperature, which help synchronize it with the day-night cycle. 

Research into circadian rhythms has revealed their importance not only in sleep regulation, but also in broader aspects of health, including mood, cognitive function, and immune response. Understanding and supporting healthy circadian rhythms, particularly in sleep regulation, can contribute to improved overall health and quality of life.