The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
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
47% of people have a nightmare at least once a month.
186
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13