Hi, I have been sleeping on a Tempur mattress for a couple of years now, and although in general I find it very comfortable, I get very hot in the night and when my partner is in the bed with me ( I weigh 8.5 stone, he weighs approx 13-14stone)I find myself slightly rolling towards him which aggravates my lower back. So we are thinking about buying a firmer mattress and recently slept on a friend's medium firm micro-coil mattress, but it was too firm and gave me hip and back pain. I sleep on my sides, back and stomach, and am not sure what sort of mattress we need. Incidentally, my partner loves the Tempur mattress, but I am tired of waking up with lower back issues.