My bad, I copied the wrong link (edited now). I meant to link to the largest systematic review I could find[0]. Instead I had linked to the US recommendation wh

My bad, I copied the wrong link (edited now). I meant to link to the largest systematic review I could find[0]. Instead I had linked to the US recommendation which I was initially thinking of linking for the part where most over-recommend 8-9. Relevant part: >that compared with 7 h of sleep per day, a 1-h decrease in sleep duration was associated with 6% increased risk of all-cause mortality and a 1-h increase in sleep duration was associated with a 13% increased risk of all-cause mortality (N = 241 107 adults in 43 articles). With again, the bigger effects being under 6 but even with an per-hour average the risk from 7 to 8 is higher than 7 to 6. 0. https://cdnsciencepub.com/doi/full/10.1139/apnm-2020-0034 https://cdnsciencepub.com/doi/full/10.1139/apnm-2020-0034