What is the cause? CONDITIONS: that may lead to the cause are new $300 mattress about the time it started (March 05). increased computer time, elbows leaning on desk. two years on a pull out, prior to new mattress. SYMPTOMS: include deadness/lite pain between lower part of sholder blades lasting 5 - 15 minutes in morning after wake-up. HEALTH: I sleep flat on back, non smoker, some exercise, 5'11" 160 lbs 40 resting heart rate 68 resting bp 106/73