Want to Sleep Better and Live 15 Percent Longer? A Massive New Study of 71173 People Over 30 Years Has Some Incredibly Good News Here’s some incredibly good news, especially if you’re the kind of person who wants to sleep better and live longer — maybe even many years longer. Let’s start with living longer. An enormous study recently combined two research projects that examined data on a total of 71,173 people, some of them over 30 years, and found that having an optimistic outlook on life was associated with living significantly longer. The researchers, from several institutions including Harvard, drew on data from the Nurses’ Health Study (NHS) the Veterans Affairs Normative Aging Study (NAS). They found that maintaining an optimistic outlook was associated with greater longevity than their less-optimistic peers,regardless of other factors that we associate with longer life, such as: “Our results further suggest that optimism is specifically related to 11 to 15 percent longer life span, on average, and to greater odds of achieving ‘exceptional longevity,’ that is, living to the age of 85 or beyond,” the study’s authors wrote. The study was published in Proceedings of the National Academy of Sciences.