Bats sleep 18-20 hours per day.
5
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
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
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149