Different people do differently on Provigil. Generally, it works best for people who are not extremely drug sensitive, and for whom pain is not a major part of the illness. You can find various threads discussing Provigil
here; you can find my posts on my experience with Provigil
here. A quick summary of my experience: I found that Provigil made a major improvement in my energy level and quality of life during the 8 1/2 years that I was able to take it. I definitely think it's worth a try for most people, especially if you start at a small dose. Unlike stimulants such as amphetamines, Provigil helps increase the production of ATP in mitochondria, so it does give you some extra "real" energy to work with. However, it's still possible to overestimate how much of the energetic feeling you get is "real"; if you do, you can suffer the crashes that
@L'engle referred to. Personally, I did not have that problem.