In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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You forget 90% of your dreams.
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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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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The human brain is more active during sleep than during the day.
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44% of kids watch television before they go to sleep.
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