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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47% of people have a nightmare at least once a month.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Honeybees never sleep.
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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 hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23