Side sleeping lessons snoring, improves circulation, side sleeping is a good way to sleep, but it does cause pressure points to be agitated and worsens wrinkles & breast sagging. We always recommend that everyone makes sure they get proper back support!
Side sleepers do best on medium to soft mattress to gently contour to your unique shape, while providing the body with the support it needs to give you proper alignment. Your hips and shoulders support most of your weight. A bed that is too hard can cause pain on hips, shoulders, knees, ankles, and elbows, and will likely cause your lower back to sag rather than maintain natural, straight alignment.
Your ideal mattress firmness is likely in the medium to soft range, and the comfort layer of the bed should be thick enough to accommodate your curves and cushion pressure zones. You should feel as if your spine is straight (as in parallel to the ground) when you are lying down.