Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
Dieters who sleep more take off more fat that those who sleep less.
159
You burn more calories sleeping than you do watching television.
348