You forget 90% of your dreams.
256
Cows can sleep standing up, but they can only dream lying down.
745
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The strangers in your dreams are actually people that you've seen in real life.
50
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28