On: Researchers identify sleep as a reason why persona...

[ummonk]

It's also possible that those who sleep 8-9 hours are people who need 10+ hours of sleep but settle for 8-9. Whereas those who sleep 7 hours are those who only need 7 hours.

[rconti → ummonk]

From everything I've read, it's exceedingly uncommon to need more or less than the range of 7.5-9 hours a night.

[tempestn → rconti]

As long as you're getting quality sleep, yes. But if you have sleep apnea or another condition that is affecting quality of sleep, greater quantity might be required to feel rested.