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
Bats sleep 18-20 hours per day.
5
You burn more calories sleeping than you do watching television.
348
The average person falls asleep in seven minutes.
115
People who sleep late have more mental stamina and can outperform early risers.
33
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212