Sea otters hold hands while sleeping so they don’t drift away from each other.
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44% of kids watch television before they go to sleep.
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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
If you hold farts in during the day, they'll just come out when you 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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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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