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Sleeping Less in Old Age May Be an Adaptation to Surviving in Wild

A study of the Hadza people in Tanzania offers an intriguing explanation as to why younger people everywhere tend to sleep later, while their elders are awake at the crack of dawn. As reported by New Scientist, researchers believe the differences in our internal time clocks may have evolved as a survival method over the ages, allowing someone to be awake as a protective measure while others sleep, quite like what animals in the wild do. This is an interesting take on how our sleep needs...

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