In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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The strangers in your dreams are actually people that you've seen in real life.
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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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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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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 cat sleeps about 2/3 of the day.
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