21. Take a Quick Nap
Sleeping too much during the day can make you feel even more groggy and grumpy than before, but taking a quick nap can do your happiness levels some good. A 2017 study from the University of Hertfordshire found 66 percent of those who took short naps—defined as shuteye that lasts less than 30 minutes—felt really happy once they woke up, improving their overall wellbeing. Taking long naps, on the other hand, could lead to health risks.