Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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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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Cows can sleep standing up, but they can only dream lying down.
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Those who get out of bed by 7am are more likely to be thinner and happier.
20
Termites work 24 hours per day and they do not sleep.
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People who sleep late have more mental stamina and can outperform early risers.
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