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
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Dieters who sleep more take off more fat that those who sleep less.
159
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15