There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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The human brain is more active during sleep than during the day.
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47% of people have a nightmare at least once a month.
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Dieters who sleep more take off more fat that those who sleep less.
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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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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Bats sleep 18-20 hours per day.
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