But are there any other reasons why going to sleep makes us happy?
So we asked our social communities on Facebook and Twitter on #HappinessMonday why sleep made them happy!
1. Because beauty sleep isn't just for sleeping beauty
2. It rejuvenates you from the day before and fills you with energy
3. For 5-9 hours a day it gives you peace
4. It's great when you have kids!
Why does sleep make YOU happy? Add your comment below.