Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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.
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A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
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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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Bats sleep 18-20 hours per day.
5
If you hold farts in during the day, they'll just come out when you sleep.
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