how long are you doing these night shifts for? because after a while your body will get used to the day sleeping and you'll be fine. but if its a shift pattern then be prepared to be tired for a good few weeks, switching back and forth is the killer. i say 3 - 4 red bull and try to keep busy, if you cant, then talk to people. after a while of working dodgy shifts you start to destroy your sleep patterns totaly. ie. sleep when tired, don't when your not. only needing a few hours at a time. not healthy but just about works.
stu