"Dysania" is the state of finding it hard getting up out of bed in the morning.
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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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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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Dieters who sleep more take off more fat that those who sleep less.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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