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A small study on workplace environments yielded some interesting results. Compared with those in windowless offices, employees exposed to natural light slept an average of 46 minutes more per night.

Oddly enough, they also performed more physical activities outside of their workplace and had higher scores on quality-of-life measures.

“The extent to which daylight exposure impacts office workers is remarkable,” said study co-author Ivy Cheung, a doctoral candidate at Northwestern University, in a press release. “Day-shift office workers’ quality of life and sleep may be improved via emphasis on light exposure and lighting levels in current offices as well as in the design of future offices,” said Cheung.

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