I'm a 32 year old male, not in terrific condition, but solidly built. I work as a shipper and do a lot of heavy lifting. I try hard to lift properly and rarely feel any back or muscle pain at work. My bed is only a year old and normally comfortable, but over the last several weeks I've been waking up feeling as though my upper chest and back(mostly back, though) are compressed. I assume this has something to do with my bed, but in the meantime is there a way I can sleep to help prevent this sensation? What might be wrong?