The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Those who get out of bed by 7am are more likely to be thinner and happier.
20
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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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.
15
You burn more calories sleeping than you do watching television.
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The human brain is more active during sleep than during the day.
28
The average cat sleeps about 2/3 of the day.
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