In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Bats sleep 18-20 hours per day.
5
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
47% of people have a nightmare at least once a month.
186
Termites work 24 hours per day and they do not sleep.
57
You burn more calories sleeping than you do watching television.
348
Cows can sleep standing up, but they can only dream lying down.
745