The average cat sleeps about 2/3 of the day.
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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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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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Cows can sleep standing up, but they can only dream lying down.
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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