Just about every Sunday evening I go on pub crawl ride. Early on, I probably had a few too many through the night (not so much in the sense of riding while intoxicated, since they were spread over several hours), and Monday mornings would be tough. Then for Lent (still hangin' onto the faith), I gave up alcohol altogether. Now that I'm drinking again, I find that I can try to limit the evening to a couple of beers, have a good time, and still roll out of bed for work. I think perhaps the period when I was drinking more was instrumental in seeing the difference when I only had one or two, so strangely, my advice to you is to start drinking heavily.*
*then cut back.