I don't know if this is catagorized as an official day-after effect, but the thing that's most noticable for me is that I seem to be attuned to a different frequency in my body. It's like that roller coaster feeling in your stomach, except sometimes its in your teeth or a foot or an arm. Mostly in the stomach though. Oh, and that guy that says 'don't forget your nipples'? He's so right. They are...