One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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People who sleep late have more mental stamina and can outperform early risers.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Those who get out of bed by 7am are more likely to be thinner and happier.
20
The human brain is more active during sleep than during the day.
28
Bats sleep 18-20 hours per day.
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