One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Bats sleep 18-20 hours per day.
5
The strangers in your dreams are actually people that you've seen in real life.
50
The human brain is more active during sleep than during the day.
28
Cows can sleep standing up, but they can only dream lying down.
745
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
If you hold farts in during the day, they'll just come out when you sleep.
16