Going to bed early might be uncool, but it will make you happier, healthier, and probably improve your bottom line, reports Inc.

One night “I called Mark [Zuckerberg] at 9 p.m. He said he was at a dinner and asked if he could call later so I told him I’d be up for another 30 minutes,” Sandberg related on Quora. “The next morning he reached out asking if I was feeling ok; he assumed that I’d been sick since I went to bed at 9:30 p.m. I explained that with two young children, 9:30 p.m. was often my normal bed time.” 

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