I had mine pulled a few months ago. I decided to stay up for the whole thing, primarily because the thought of being knocked out completely was a little disconcerting, I knew I'd feel really really groggy the rest of the day, and I'd have to not eat dinner the previous night. ich. Luckily it went just great, took maybe 30 minutes at most (my teeth were all erupted, only reason I had to take them out was they were starting to fall apart for some likely-nutritional reason.) I felt absolutely nothing for the first tooth, didn't even realize it was done. The second tooth I felt pressure that seemed like it might get further into pain, I made some noise, and the surgeon says "felt something there? we can fix that!" and just gave me some more numbing shots. Didn't feel anything for the rest of the procedure.
Of course, about 3-4 months later I got appendicitis and had to go under anyway...which was actually kinda fun. Supposedly the sentences I thought I was saying as it was taking effect came out as gargling nonsense, but its amazing how fascinating fluorescent lights can be.