There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Bats sleep 18-20 hours per day.
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Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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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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47% of people have a nightmare at least once a month.
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