The only evidence I have is from introspection, but it's happened so often I'm wondering if it's a more common experience. The day after drinking heavily my mind is not sluggish. It's lightning fast. I'm extremely sharp, I talk very quickly, produce more jokes, see though irrational reasoning, and, as more of an aside, am extremely happy. More happy than I ever am despite my physical self feeling like puking. Any research to support this or have you personally had a similar experience?