Sleeps for: 18-22 hours a day
Snooze Stats: You know how you feel like passing out after eating a juicy burger and a side of chili fries? That's how a koala feels after nomming on eucalyptus leaves. The fiber-heavy diet requires a lot of energy. In order to digest it all, koalas spend 75-percent of their day dozing in the trees.
Image via Alamy