The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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The human brain is more active during sleep than during the day.
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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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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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Bats sleep 18-20 hours per day.
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