Does Sleep Duration actually make a difference, or is it overhyped?

Sleep duration and mortality risk is one of the more extensively meta-analyzed relationships in sleep research, with multiple independent meta-analyses of prospective cohorts consistently finding a U-shaped relationship: both short and long habitual sleep are associated with higher all-cause and cardiovascular mortality compared to moderate durations. Weighing the data: Sleep Duration looks well-supported and consequential — the evidence is rated strong (81/100) and its estimated impact on longevity is also rated highly (83/100), making it one of the more solidly-backed choices on Vitaebase.