I was put on Provigil to counteract needing to sleep 16 hours or more a day. It worked, and after about 3 days, I stopped taking it. It seemed to reset a more normal day/night cycle, but for those 3 days I barely slept.

Ritalin did nothing for me. After a couple of months, I stopped taking it. I don't recall there being any major side effects of it, just a disappointing lack of effect. I could really use some help in focusing, even now, 7 years later.