The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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The average cat sleeps about 2/3 of the day.
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Bats sleep 18-20 hours per day.
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47% of people have a nightmare at least once a month.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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Dieters who sleep more take off more fat that those who sleep less.
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