A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Dieters who sleep more take off more fat that those who sleep less.
159
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Termites work 24 hours per day and they do not sleep.
57
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
The human brain is more active during sleep than during the day.
28