A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
People who sleep late have more mental stamina and can outperform early risers.
33
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Those who get out of bed by 7am are more likely to be thinner and happier.
20
The average person falls asleep in seven minutes.
115