Sunlight plays a crucial role in regulating our sleep-wake cycle, also known as the circadian rhythm. Exposure to sunlight during the day helps to keep our internal body clock synchronized with the external day-night cycle. Sunlight exposure also influences serotonin levels, which can affect mood and energy levels. Getting enough sunlight during the day can help you feel more alert and energized, which in turn can improve the quality of your sleep at night. www.sleepresearchfoundation.com #Sleep