Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Bats sleep 18-20 hours per day.
5
Cows can sleep standing up, but they can only dream lying down.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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