That must have been a typo. From what I have read, sleep for more than 9hr is negatively correlated with good health: https://www.webmd.com/sleep-disorders/phy

That must have been a typo. From what I have read, sleep for more than 9hr is negatively correlated with good health: https://www.webmd.com/sleep-disorders/physical-side-effects-oversleeping https://www.webmd.com/sleep-disorders/physical-side-effects-...