There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Cows can sleep standing up, but they can only dream lying down.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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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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Dieters who sleep more take off more fat that those who sleep less.
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