Provigil, the new "Limitless"?

I love science fiction. And I love it when science fiction becomes science fact - the Roomba (Heinlein), communications satellites (Clarke), Dick Tracy radio watches. But Provigil...it sounds way creepy. We need to keep an eye out for people with exploding heads, I think.

What do you think? Speed, by prescription? Or a bold new frontier in five-hour energy?