Moved this to the off topic sub forum - hope you don't mind.
I do mind.
Why does chair get to be in the ergo section and bed is not?
People spend more time in bed in their entire life than in anything else.
are you just being stupid? a mod moved your post for a reason, it doesn't belong in the ergo section, cuz this bed has nothing to do with computing/keyboards, anymore arguments and you're just trolling to be dumb.
that said, try investing in a memory foam topper, usually you'll find a the 2'in variety common. Tho if it's for 4 ppl, you're probably gonna want "dense" memory foam and probably get a 4in topper. Take note this will raise your bed, that high, also some of your fitted sheets might not even fit anymore (depending on the depth, usual store bought fitted sheets are about 18in max depth)
if you end up liking it, you might want to invest in a full memory foam bed, i've tried both, imo about the same. (you get to try out the nice big beds in hotels, the marriot usually has tempurpedic beds, if you travel)