"Dysania" is the state of finding it hard getting up out of bed in the morning.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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You burn more calories sleeping than you do watching television.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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The average cat sleeps about 2/3 of the day.
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47% of people have a nightmare at least once a month.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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