You will be a bit dehydrated. Groggy maybe. Unresponsive, duno. When I used to drink, I never got hangovers, I would just wake up and go (I also down 1 full bottle of water at night when I drink). Not so sure its the same with me getting creaky at the ripe old age of 22 :nervous:
You will make alot less progress I think. But sweating it out, and at least doing something, if your diet was good all day, will help out and sustain.