I know some folks will sleep on their camp mattress at home for about a month or two. After that its easy to sleep in the woods. It takes some commitment though. I did it for two months about a year ago and still don't have problems on the ground anymore. After the first week and half it felt just fine. You know some cultures still sleep on grass mats on the ground. Bedding is actually not a natural thing - as a matter of fact I think they suggest sleeping on the floor if you have back problems. Just thought I would throw that out there. Maybe some other brave soul will give it atry and report on the effects.

http://www.absolutecomfortonsale.com/a-why-Sleep-on-a-mattress.htm
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