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
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
Termites work 24 hours per day and they do not sleep.
57
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149