In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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People who sleep late have more mental stamina and can outperform early risers.
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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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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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