I find that if you've been ridng all day and then drink you get drunk really quick. It happend to me the other week I didn't even drink that much and I was absalutly pyjamad I even got twated round the face by someone and we got chucked out god knows what I did to him.
I always try to eat a good dinner before drinking too and I always drink loads of water before going to bed it helps for the next day.