The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
You forget 90% of your dreams.
256
The human brain is more active during sleep than during the day.
28
You burn more calories sleeping than you do watching television.
348
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28