There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Termites work 24 hours per day and they do not sleep.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The human brain is more active during sleep than during the day.
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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.
240
Sea otters hold hands while sleeping so they don’t drift away from each other.
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A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6