47% of people have a nightmare at least once a month.
186
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Bats sleep 18-20 hours per day.
5
Lack of water is the #1 trigger of daytime fatigue.
148
If you hold farts in during the day, they'll just come out when you sleep.
16
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Cows can sleep standing up, but they can only dream lying down.
745