Honeybees never sleep.
276
Cows can sleep standing up, but they can only dream lying down.
745
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
Lack of water is the #1 trigger of daytime fatigue.
148
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23