So you've always craved a koala for a pet. Well, wake up to the truth: koalas are a snooze! They top the list of sleepiest sleepyheads in the animal kingdom. The critters shown here spend more than half the day in dreamland. How long do you sleep?
1. Koala - sleeps up to 22 hours
2. Sloth - sleeps up to 20 hours
3. Armadillo - sleeps up to 19 hours
4. Opossum - sleeps up to 19 hours
5. Lemur - sleeps up to 16 hours
Source: The Top 10 of Everything, 1997, by Russell Ash (DK Publishing Inc.)