You forget 90% of your dreams.
256
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
People who sleep late have more mental stamina and can outperform early risers.
33
The average cat sleeps about 2/3 of the day.
203
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Sea otters hold hands while sleeping so they don’t drift away from each other.
104