A Life Hacker news report examines the impact of sunlight on a person’s circadian rhythm and sleep quality.
Just like blue light is bad for your nighttime sleep schedule, light during the day can actually help you sleep better at night. Harvard Health Publications explicitly suggests exposing yourself to bright light during the day, as this will “boost your ability to sleep at night.”
A number of studies on circadian rhythm support this. In one study, researchers compared the sleep quality of 27 people who worked in windowless environments with 22 workers exposed to significantly more daylight.
It was enough for them to conclude that office environments should have more exposure to daylight so workers can get better sleep.