In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
You burn more calories sleeping than you do watching television.
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47% of people have a nightmare at least once a month.
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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
"Dysania" is the state of finding it hard getting up out of bed in the morning.
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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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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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