Few things are as blissful as taking a short nap during the day. So why not make this a regular self-care habit? This will depend largely on your lifestyle, but if you have the time and flexibility, 20 minutes is all you need to wake up feeling “rebooted” and ready for a fresh start. And the science backs it up. According to a survey of 2000 Americans, self-identified nappers were 90% more likely to say they were happy. And in a different study, researchers found that people who nap for 30-90 minutes show signs of better cognition and lower stress and anxiety.