Same here, for the last 20 years at least, total around 7h/day of which 4-5 by night. At school I slept 9 hours continuous, but that's over 60 years ago. In those times I worked all day and was afloat a couple of hours.Some nights .. more like 5hrs. I can nap in the day. 90% of the time I can fall asleep within minutes
I open the e-book at night and have read more eng lit in the last 5 years than in all my life before. Recommend anything from Jane Austen and Trollope to KC Constantine and Enchanted April.
Being too lazy now to want to change and having met no real problems, I take it as is. I think even my ½h/day erg helps stabilize things too - and maybe the Mediterranean diet with plenty of fruit and veg but zero alcohol. If.. don't fix..
Sleep research is all well and good. Necessarily human research applies to a certain set of conditions and to a certain target cohort that might buy it, which may not be our current situation.