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A new study may shed light on why teenagers sleep late while grandparents are often up at the crack of dawn. Fifty years ago, psychologist Frederick Snyder proposed that animals who live in groups stay vigilant during sleep, by having some stay awake while others rest. However, no one had tested this sentinel hypothesis in humans until now. Jeff and Anthony discuss the findings and test the theory in their own lives.

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Today’s story was sent in by Katherine Tuck: https://www.newscientist.com/article/2140394-sleeping-less-in-old-age-may-be-adaptation-to-survive-in-wild/#link_time=1499849804

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