A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Termites work 24 hours per day and they do not sleep.
57
Dieters who sleep more take off more fat that those who sleep less.
159
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
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