In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The average cat sleeps about 2/3 of the day.
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Cows can sleep standing up, but they can only dream lying down.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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