Also, it is a good idea to try a thinner mattress. Thick mattress - on the bed or not - can acquire some deformations that can make you feel uncomfortable. Thin mattress on the floor just physically cannot deform in a way that you cannot fix by shaking at a bit. It is said to be good for your spine, too.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: