Sleep deprivation is increasing our risk of serious illness
One thing that never seems to be discussed in these type of articles is that for most people time awake is significantly more valuable than time spent asleep. An extended lifespan is of little use to me if those extra hours are spent unconscious.If I spend 10% extra of my time awake (2.4 hours) but shorten my life by 5%, that seems like a worthwhile trade-off. (That's just an example; I've no idea if those figures are in any way plausible, but I'd be interested in any research that tried to figure out the optimum level of sleep for maximum life-awake time.)