The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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.
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People who sleep late have more mental stamina and can outperform early risers.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Bats sleep 18-20 hours per day.
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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.
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A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
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