One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Cows can sleep standing up, but they can only dream lying down.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The average person falls asleep in seven minutes.
115
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Dieters who sleep more take off more fat that those who sleep less.
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44% of kids watch television before they go to sleep.
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