Sorry, I should have included the link; https://en.wikipedia.org/wiki/Red_hair#Pain_tolerance_and_injury https://en.wikipedia.org/wiki/Red_hair#Pain_tolerance_a

Sorry, I should have included the link; https://en.wikipedia.org/wiki/Red_hair#Pain_tolerance_and_injury https://en.wikipedia.org/wiki/Red_hair#Pain_tolerance_and_in... When I had my appendix removed when I was about 12 I awoke and tried to sit up in the middle of the operation. I remembered it and confirmed it with the doc in post-op. The OP's story of waking up during the wisdom tooth extraction reminded me of my experience. Years later I learned of the connection between pain tolerance and red hair, which I have.