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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Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
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Cows can sleep standing up, but they can only dream lying down.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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44% of kids watch television before they go to sleep.
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