In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Cows can sleep standing up, but they can only dream lying down.
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The average cat sleeps about 2/3 of the day.
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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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Dieters who sleep more take off more fat that those who sleep less.
159
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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