Thanks to all the data science has gathered over the years, we know that not getting enough sleep leads to a shorter life. But there's one more thing that the data has also shown us. And that is the relationship between sleep and mortality risk is not linear. You see, the more and more sleep you get, doesn't mean that your risk is lower and lower.Instead once the average sleep amount surpasses 9 hours, there is an upward hook in mortality risk.Just like with sleeping less than 6 hours every day, there is a higher chance of premature death, if you sleep over 9 hours daily.So what is going on here?Are we supposed to be aiming for exactly 8 hours to live a long and healthy life?Not quite.

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