The average cat sleeps about 2/3 of the day.
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If you hold farts in during the day, they'll just come out when you sleep.
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You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "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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The human brain is more active during sleep than during the day.
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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 record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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