I had to move onto an air mattress for awhile so I could sleep in our living room and it was so uncomfortable.  I to remedy this, I ordered this 4" down alternative plus a 3" memory foam.  I stacked them both on the air mattress and wow!  I sleep solid all night and wake up with no pain at all.  In my real bed, I wake up in pain plus I toss and turn all night.  I can't wait to move this topper (and the other foam one I bought) onto my real bed. It's so amazing now already.