The circadian rhythm is our inner clock that helps manage physiological processes in the body, including temperature regulation, cortisol, sex hormones, metabolism, digestion, immune function, alertness, and sleep. Light exposure throughout the day plays an essential role in regulating the circadian rhythm and therefore impacts the quantity and quality of sleep.
Natural daylight exposure outside, at high intensities, advances the timing of sleep, improves sleep quality, and affects the duration of sleep. It has been shown that for each additional hour spent outdoors, sleep is advanced by 30 minutes, occurring that much earlier.
