According to Iowa Public Radio, a Journal of Clinical Sleep Medicine study finds that the amount of natural light office workers are exposed to may impact the duration and quality of their sleep.

“If you’re in a darker room, you’re sleepier, melatonin seems to increase, and your whole day as such can be screwed up, your daytime and your nighttime. But if you’re wide awake during the day, with […] the early afternoon brightness of the sun, that decreases sleepiness tendency gets you good and going for the day, and then by the time it’s night, you’re ready to sack out.”