The strangers in your dreams are actually people that you've seen in real life.
50
Cows can sleep standing up, but they can only dream lying down.
745
The human brain is more active during sleep than during the day.
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
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
You burn more calories sleeping than you do watching television.
348
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212