This is so much bull!!
My family have all been 10-11 hours a night sleepers, going back generations.
My mother passed away from pneumonia (an alchoholic who had a 4-pack-a-day ciggie habit) at age 76, this after having beaten cancer to a stand still three times!
She died young, as everyone else was living well into their late 80s and early 90s.
So Grandma was a victim of old age?