> ... seen studies about less sleep improving lifespan... Sleeping less than your own individual sleep need probably does not improve life span. The participan

> ... seen studies about less sleep improving lifespan... Sleeping less than your own individual sleep need probably does not improve life span. The participants in the studies you're referring to who slept vastly more than others were those with sleeping disorders, some with extremely bad sleep apnea. They felt the need to sleep more because the quality of their sleep was so poor. But of course, having a lot of poor-quality sleep is not equivalent to having fewer hours of good-quality sleep. The contribution I would like to make to this discussion is that each person's sleep need is individual.