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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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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The average person falls asleep in seven minutes.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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The strangers in your dreams are actually people that you've seen in real life.
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