expensive mattress / cheap mattress rant
About two years ago I was having terrible back issues. I could barely sleep, was in pain all day and at wit's end. Went to a mattress shop at the worst time, and put down $5k for a twin mattress. Over the past couple of years I've trained myself to become a back sleeper, stretch a little more, and do fewer of the exercises that used to hurt my back. No more back pain.
Fast forward to now where I've been on a remote job for a couple of months in a very low budget accommodation, sleeping on what is probably an $80 moderately firm piece of industrial foam. I'm getting the best sleep of my life. Same thing happened when I stayed at my friend's hostel.