Your Body’s Internal Clock: Why Circadian Rhythm Matters Written by: Clement Ng, Nutritionist of HealthPro | 6 minutes read Circadian Rhythm A circadian rhythm is your body’s built-in 24-hour internal clock that regulates various physiological processes, including the sleep-wake cycle, hormone release, metabolism, and body temperature (Victoria A. Acosta-Rodríguez, 2021). Your body thrives on routine and functions optimally when its internal clock is aligned with the natural cycle of daylight and darkness (Tracey L. Sletten, 2022). This alignment helps coordinate b..