On my last day of work (I work 8, 10hrs days in a row, then I get 6 days off) I try to stay up till approx. 10pm (thats about 28 to 32 hrs of being up) then I go to bed and I'm back on a 1st shift timeframe..
Then as I transition to go back to work I get up around 8am that morn, go to work that nite and go to bed the following morn after work (about 26hrs of being up)..
Also since I work rotating days on/off I never know just what day of the week it it (just ask Mrs.Tank)..
Tank