Bats sleep 18-20 hours per day.
5
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
People who sleep late have more mental stamina and can outperform early risers.
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The human brain is more active during sleep than during the day.
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Cows can sleep standing up, but they can only dream lying down.
745
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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