I have been using a firm mattress for a while. Mostly my sleeping position is side sleeping or stomach sleeper. I find it a bit difficult to go into sleep. I have heard a pocket coil mattress can be a good choice, Individually coiled pockets won’t disturb the other person when one tosses and turns. I heard Simmons is a good brand but have heard it doesn’t last longer than 3 years? Looking for some recommendations and advice. Also, where can I purchase the mattress with good deals other than the obvious big box stores. What brand of mattress would you recommend?