In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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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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Those who get out of bed by 7am are more likely to be thinner and happier.
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Cows can sleep standing up, but they can only dream lying down.
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Dieters who sleep more take off more fat that those who sleep less.
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The human brain is more active during sleep than during the day.
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