Those who get out of bed by 7am are more likely to be thinner and happier.
20
The human brain is more active during sleep than during the day.
28
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
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
The average person falls asleep in seven minutes.
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