Wife is side sleeper with moderate RA, I am a back sleeper with back issues. We barely slept 2 hours the first night, she was crying in pain with her hip and back.  Neither of us could barely walk when we got up.  During first week, we slept 3-4 hours a week and had to get out of bed because it hurt to lay any longer.  We kept pushing through since everything said to give it 30 days for your body to adapt.  We made sure it was oriented right, tried different foundation, different sheets, even put a memory foam topper on.  Still waking up with pain.  After 30 plus days, we initiated return.  I hope this is easy.  I was surprised it was so uncomfortable to us when the reviews were stellar.