Get the sleep you need. That’s different for each of us. Don’t worry about other people’s formulas. You know how long you need to sleep to wake up feeling like a million bucks. And you also know how poorly you feel when you don’t get what you need.
Humans sleep a third of their lives. Some people find this horrifying because they find sleep to be, “a waste of time.” That we require so much sleep, suggests that sleep is a highly productive state.