I'm in the market for a new bed and stumbled across your site. I am 58 and have arthritis in my lower back. I'm 5'4", 135' physically active, walk 5 miles a day, and sleep restlessly. I added a foam memory topper to my mattress a few years back. At first I enjoyed the support as my mattress had a built in topper that was sagging in a few spots. However, the topper is hot and my spine seemed to be worse in the morning. I began to suspect the memory foam topper after a trip to Europe where I generally slept on non memory foam type mattresses. I slept well and my back was fairly good in the morning.