But nanobots won’t be limited to preserving the body’s normal function. They could also be used to adjust concentrations of various substances in our blood to levels more optimal than what would normally occur in the body. Hormones could be tweaked to give us more energy and focus, or speed up the body’s natural healing and repair. If optimizing hormones could make our sleep more efficient,[112] that would in effect be “backdoor life extension.” If you just go from needing eight hours of sleep a night to seven hours, that adds as much waking existence to the average life as five more years of
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