There has been much talk about the benefits and drawbacks of transitioning from a traditional five-day workweek to a truncated four. But what do employees do with that extra time off? Sleep. According to one study, employees who switched to a four-day workweek logged seven hours and 58 minutes of sleep per night—an hour more than they slept when they were working five days a week. Why does this matter? Because sleep deprivation is a major problem when it comes to productivity. Exhausted workers simply don’t work as well as their well-rested counterparts. In four-day workweek, the percentage of employees getting less than seven hours of sleep a night decreased from 42.6 percent to 14.5 percent. In the UK, where 70 organizations are participating in a pilot study of four-day workweeks, 88 percent of respondents said the experiment is going “well,” and 86 percent said they’d like to keep the schedule. Adam Aron, CEO of AMC theaters, agrees a four-day workweek would work in America, tweeting “Should I be out front urging a 4-day US work week?” and “It may be time for America to formally adjust to a 4-day work week, instead of 5.” Aron also tweeted that it would be “good for AMC too if every weekend is 3 days long. What do you think?”