For me, it was never the night before. I always decided on day one. As a note, before I achieved a long period of sobriety I had many three/four day periods followed by relapse. I am not trying to say that is the way to do it, but I believe that with each little period of sobriety I had, I learned how to stay stronger during the next period. Plus I learned what to expect in terms of feelings and cravings. Now, I am on my 733 day period. Remember, while it may be the goal to quit forever just focus on the day. A guy I respect at a meeting told me that my goal was just to get as much time as possible before my next binge.