There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Honeybees never sleep.
276
Dieters who sleep more take off more fat that those who sleep less.
159
If you hold farts in during the day, they'll just come out when you sleep.
16
You burn more calories sleeping than you do watching television.
348
Cows can sleep standing up, but they can only dream lying down.
745