In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
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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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Dieters who sleep more take off more fat that those who sleep less.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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You forget 90% of your dreams.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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