In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Cows can sleep standing up, but they can only dream lying down.
745
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
The human brain is more active during sleep than during the day.
28
You burn more calories sleeping than you do watching television.
348