A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Bats sleep 18-20 hours per day.
5
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
The strangers in your dreams are actually people that you've seen in real life.
50
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Honeybees never sleep.
276
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22