I woke up during a back surgery...was the worst experience of my life. I was face down on the surgical table I presume and couldn't move or speak or anything. There was just this horrifying pain in my spine and a terrible vibration (I assume they were removing bone at the time but I'm not sure) and my body began to shake violently. I could hear the people in the operating room yelling to hold me down and shoot morphine but, as I found out, I'm immune to it. A females voice said she had given as much morphine as she could and then a male voice said to shoot demerol and then I was out again.
It was so traumatic that I never even mentioned it to anyone until about a year later. I never even brought it up with the doctor..I assume he figured I wouldn't remember it because he never brought it up either. He died a few years later and all my medical records from that surgery disappeared too. So now I specifically request to be monitored during surgery. I don't leave it up the discretion of the surgeon or the anesthesiologist. My last back surgery had no complications and the doctor said the monitor results were perfectly normal. I can only guess that the anesthesiologist screwed up during the first surgery.