In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Cows can sleep standing up, but they can only dream lying down.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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Honeybees never sleep.
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The average person falls asleep in seven minutes.
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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 harder you concentrate on falling asleep, the less likely you are to fall asleep.
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