I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
I did! I noticed it written on a box of disposable earplugs at some point, so I abided. It made things marginally better in my case, but not by much. Either I was doing it wrong, or it’s that ear canal shapes are different enough that different people have to have different solution (why on Earth can some people use foam earplugs all right, and yet they just spring out of my ears?? 😆)