Your pain may be aggravated by the mattress you are sleeping on. You can put pressure on your spine by sleeping on a too soft mattress. Your lower body sinks into the mattress, causing the spinal column to become out of alignment. A firm mattress is the best. It doesn't have to be the most firm, but it should be at least medium firm. If you have sciatica, you can only make things worse by sleeping on your stomach. Sleeping…