Gen-Zers and younger millennials are skipping wild nights out in order to catch up on their Zs. According to the Wall Street Journal, data from several sources points to longer sleep on average and earlier bedtimes for people aged 18 to 35, who are happier to hit the sheets early in lieu of a late nights out with friends. Analysis by RentCafe of the American Time Use Survey found that people in their 20s are getting 8% more shuteye than they did in 2010 (up to 9 hours and 28 minutes from 8 hours and 47 minutes). Meanwhile, earlier bedtimes are changing how some restaurants and bars plan their …