If you wake up naturally sometime in that 6-9 hour window, and you sleep deeply through the night (smartwatches are good at measuring this), you’re probably getting enough sleep.
If you have reason to be concerned about your sleep, consider getting a sleep study done.
The benefits of more sleep are less relevant than the downsides of not enough sleep—chronic sleep deprivation is very, very bad.
If your mattress is noticeably uncomfortable, it sounds like you need a new mattress :)
What is the expects benefit of each additional hour of sleep? What is the QALY cost of a mattress as it ages?
(Apologies in advance if any/all of this is obvious to you)
Too much sleep is bad, too little sleep is bad. Sleep needs vary per person and throughout life but generally >6 hours, <9 hours is the range.
You don’t really sleep in ‘hours’, you sleep in cycles (https://en.wikipedia.org/wiki/Sleep_cycle) so measuring based on hours doesn’t work so much.
If you wake up naturally sometime in that 6-9 hour window, and you sleep deeply through the night (smartwatches are good at measuring this), you’re probably getting enough sleep.
If you have reason to be concerned about your sleep, consider getting a sleep study done.
The benefits of more sleep are less relevant than the downsides of not enough sleep—chronic sleep deprivation is very, very bad.
If your mattress is noticeably uncomfortable, it sounds like you need a new mattress :)