Your circadian rhythm helps regulate your natural sleep-wake cycle. Here's how to reset it to improve your sleep, according to an expert. Mercey Livingston is a health and wellness writer and ...

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 overall health.

Circadian rhythms are cycles in the body that occur roughly across 24 hours. In humans, circadian rhythms cause physical and mental changes in the body, including feelings of wakefulness and sleep.