Those who get out of bed by 7am are more likely to be thinner and happier.
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Dieters who sleep more take off more fat that those who sleep less.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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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Bats sleep 18-20 hours per day.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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