In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
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
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240