One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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People who sleep late have more mental stamina and can outperform early risers.
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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 record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Bats sleep 18-20 hours per day.
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