I read the original article and the abstract of your linked study.
First, I'd like to see a breakdown of 8 hour vs 9+ hours instead of grouping them. Someone sleeping a healthy 8 hours and someone sleeping 12 hours are very different.
There might be issues like, people who sleep 12 hours are sick, and that's WHY they sleep 12 hours and they die due to their illness.
Overall I'm guessing people who sleep a lot per day aren't very active, both career wise and going out/excising (just my guess) - and people who don't have jobs and are poor, they live less than people who do have jobs and have money. Also people who are depressed sleep more. So not all sleep is equal.
It's hard to approach health from a cybernetic point of view, but I think that's what's missing to make these studies less unidimensional. The key is how to make science more cybernetic. That I don't know.
First, I'd like to see a breakdown of 8 hour vs 9+ hours instead of grouping them. Someone sleeping a healthy 8 hours and someone sleeping 12 hours are very different.
There might be issues like, people who sleep 12 hours are sick, and that's WHY they sleep 12 hours and they die due to their illness.
Overall I'm guessing people who sleep a lot per day aren't very active, both career wise and going out/excising (just my guess) - and people who don't have jobs and are poor, they live less than people who do have jobs and have money. Also people who are depressed sleep more. So not all sleep is equal.
It's hard to approach health from a cybernetic point of view, but I think that's what's missing to make these studies less unidimensional. The key is how to make science more cybernetic. That I don't know.