Cows can sleep standing up, but they can only dream lying down.
745
You burn more calories sleeping than you do watching television.
348
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The average cat sleeps about 2/3 of the day.
203