Dead Winter
STAHP
It has nothing to do with sleeping or staying awake...well, not the action of doing either, rather. It works to stay awake as long as you can because you'll only sleep 9-10 hours, maybe 12 hours, and by that time the alcohol will have already passed through your system. If you go to sleep immediately after getting hammered, the alcohol is still in your system. By not passing out, you're getting a head start on processing and expelling the alcohol, by drinking water you're keeping your body hydrated because alcohol dehydrates you (and that's basically what a hangover is), and by going to sleep as late as you can while doing all of the above, you insure that by the time you wake up you'll already be fully hydrated and will have processed and passed all the alcohol in your system...hence, no hangover.