Does anyone know how to get a mattress that suitable for a couple of different sizes? My DH is two-and-a-half times the size of me. When we slept in our old, firm mattress, I rolled into him every night. We bought a fancy new soft pillow top mattress a couple years ago but it seems to be indented where he sleeps now. I get a backache each morning, possibly because we flip the mattress & I end up sleeping in a dent, so I'm looking for another solution. I was thinking of getting a memory foam mattress but the manufacturer said it would also end up with a depression over time. I imagine his side may end up wearing out fast, particularly if we stop flipping the mattress. So now I'm thinking of getting two twin mattresses. I don't know. Does anyone else have this problem - what works for you?