Follow-Up: Hi Laurie, I too have FMS, along with arthritis. In my case, the type of mattress doesn't seem to matter. I have one of the good "egg-crate" mattresses on type of my regular one to help take some pressure off sore spots and it gives a little relief. This may be an something to try for a lot less money, before you try some of the high dollar "wonder mattresses" out there. According to the National Arthritis Foundation and rhuematologists there is no "miracle cure", only money makers for others. Good luck with your search. A fellow sleepless FMS sufferer.