Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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Bats sleep 18-20 hours per day.
5
The higher someone’s I.Q. the more likely they are to be sleep deprived.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
194
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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