Yeah, the normal autopilot is present within everyone, but a girl called me to make sure I was OK, I didn't hear the phone when she called and didn't see that she had called before I got home. From what I can gather from my phone history I called her out of instinct (I always call back when someone calls me), but I hung up before the call went through because I obviously reasoned out I was so drunk I probably shouldn't call her.
Also once at a school trip we were told that we had to be back in our beds at 12am at the latest. This time I was also very drunk, but I made sure that I got to bed before anyone had to tell me, it wasn't because I was sleepy, it was because it was what I would have done if I was sober. I also always brush my teeth even if I am barely able to stand up.
From what I can see from people I know this is not something everyone does, but maybe I just get more drunk than the others I know.