Nice little article.

I currently use a 200mg dose of Modafinil to sleep only once every other night, which vastly increases the hours available to me for useful work. I get pretty sleepy toward the end of 'Day 2', but I can still do tasks that don't require much creativity or concentration, like typing up article bibliographies, cleaning my room, etc. My mood doesn't seem to be changed much, either, and I don't feel any addictive effects. Nobody else I've talked to has been able to achieve this with Modafinil, though several people I know use it to maintain concentration throughout a full day's work.