Came here to write similar causal / correlation point . If you currently sleep <7 or >9 hours dont take this as a prescription to change your sleep pattern.

Came here to write similar causal / correlation point . If you currently sleep <7 or >9 hours dont take this as a prescription to change your sleep pattern. I would assume there is an underlying cause to your sleep needs and that solving the underlying cause is the true path to longevity. For example if you're sleeping more because you're recovering from burnout or a major surgery. Then taking the sleep to speed recovery is (i presume) a better choice than artificially restricting sleep in the name of "longevity" ...