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
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
The human brain is more active during sleep than during the day.
28
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Bats sleep 18-20 hours per day.
5