Bats sleep 18-20 hours per day.
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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!
6
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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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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