I've been doing the 3rd shift thing for most of going on 20 years. Part-time during college, and full time since then (with a year or 3 of 1st shift thrown in there).

All of the recommendations given so far are great. If you need the caffenated(sp) beverages, stick to the diet stuff. The extra calories from the regular stuff will add up after while, trust me I know. I tend to stick to water until about mid-shift, then I bust out the keys to the soda fountain and grab a liter of diet cola that lasts me until the end of the shift (i'm not a coffee drinker).

OGRE