That's interesting and supports the idea that it might be related to genetic factors. I've had two twilight anesthesia procedures done about two months apart and remember the events before and after waking up in a lot of detail. I've also had regular general anesthesia once in my life, with the same result. As a bonus, I seem to resist local anesthetics to a degree that requires 2-3 times the amount a normal person does (and even then, the pain finds a way through).