Hello Dr. Andrew Rynne... During the past 2-3 weeks, when I lay down to go to sleep at night, I awake during the middle of the night with my right arm, elbow down to my right hand, NUMB. At first it felt like I was sleeping on it wrong and it fell asleep ... but during the past 2 weeks, especially last night, it was just VERY PAINFUL, with a THROBBING the likes I have never felt before. I got out of bed at 4:00AM and attached a TENS DEVICE t the arm / hand, and it seemed to bring relief and I was able to get some sleep. ANY IDEA WHAT THIS COULD BE? What the cause could be?