My husband is experiencing back pain (middle and lower) every morning he wakes up, from past one week. A month back he met with an accident and his collar bone got broken, he is wearing sling as per doctor suggestion. Due to his injury he is not able to turn and sleeping in same straight position resulting in back in pain. One day he slept in different bed and we observed the pain was much less that day.  We are sure that changing the mattress will help him. Please suggest what type of mattress we should use to get rid of back pain. Please specify brand name or model name if possible. It will be really helpful