Interesting. Maybe we all get a more or less set number of waking hours to live? (disease not withstanding). Maybe 95 year olds just sleep a lot and those wh

Interesting. Maybe we all get a more or less set number of waking hours to live? (disease not withstanding). Maybe 95 year olds just sleep a lot and those who die early do so because they burned up their waking hours sooner! I think I read that mammals more or less get the same number of heartbeats in a lifetime -- so Hummingbirds don't last so long but Elephants live a long time (due to slower heart rate vs very high heart rate for a Hummingbird). I suppose sleeping more might correlate to a lower average heart rate (and thus a longer life).