People who sleep late have more mental stamina and can outperform early risers.
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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!
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Cows can sleep standing up, but they can only dream lying down.
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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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