Sleep deprivation is a serious workplace and health issue.

By Barb Darrow
March 13, 2017

In case you didn’t know: March 13 is National Napping Day, according to this helpful calendar. That’s the day after most Americans move their clocks up an hour for Daylight Saving Time.

Nap day is a cute idea, but there’s a serious business concern here.

According to a study released late in November by think tank RAND Europe, sleep deprivation among workers costs the world’s economy $411 billion annually. Among the countries surveyed, Japan’s gross domestic product was hit hardest by lack-of-sleep issues, which sapped its GDP by 2.92%, followed by the U.S. at 2.28%, according to the study.

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Sleep deprivation has the potential to zap productivity and be detrimental to one’s health—two key concerns for tech and other companies. That’s why many companies—including Uber uber , Google googl , Zappos, PwC, Ben & Jerry’s, and AOL aol —all have corporate-sanctioned nap rooms.

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Then there’s Huffington Post co-founder and Uber board member Arianna Huffington, who has made sleep—or lack thereof—her latest crusade. Promoting getting a healthy amount of sleep is the focal point of her new company Thrive—including through the installation of napping pods in offices—to improve productivity.

Among her other tips for stressed-out sleepers: Don’t take your phone or tablet into the bedroom, and if at all possible, take a nap if you need one.

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