Read my comment more carefully. I didn't say there's conclusive evidence of a link - just that a cautious individual who wants to maximise their lifespan will p

Read my comment more carefully. I didn't say there's conclusive evidence of a link - just that a cautious individual who wants to maximise their lifespan will probably assume that it's best to sleep 6-8 hours a night. Edit: Of course, that's assuming the study results are actually correct, which according to ajkirwin's comments, they're possibly not.