Mattresses, what’s your recommendation and why?

Maybe I’m an oddity, but I get a chuckle out of people worrying about mattresses. I can sleep on carpet covered concrete. I’ve had a good nap on a gravel driveway with my jacket as a pillow. Hiked many hundreds of miles sleeping at night on a tiny little thin mattress. Never slept better than on a 1-1/2” self-inflating mattress in a tent even at 60 years-old.