A fit young man might tremble strapped on a guillotine, but an octogenarian, with joint pains, watching his grand- grandchildren play in his sunny backyard, would gladly go to sleep soon, perhaps becoming willing feed for the ever-present predators in former times. Nature has a way of making permanent sleep desirable. and life possible for the young, the deserving.
Natural death, of old age, is a satisfying experience "dying old and satisfied" ( one of the few biblical truism).