In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Dieters who sleep more take off more fat that those who sleep less.
159
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Bats sleep 18-20 hours per day.
5
The average person falls asleep in seven minutes.
115