I have had problems with fatigue and daytime sleepiness for years. I was often so tired that I would sometimes have trouble staying awake while driving to work in the morning. In the last year I have added both modafinil (Provigil) and Concerta (long-acting methylphenidate or Ritalin) to my regimen and I feel like a new person. I still have days when I sleep too much and feel tired, but I feel so much better. I have my life back and can count on productive days and having fun again. I don't feel wired at all and seem to sleep well. I had been given a possible diagnosis of Chronic Fatigue Syndrome, but now I don't think that that was accurate at all. I don't know what the source of the fatigue is and I'm not sure I ever will. I've had all sorts of tests and nothing has ever come up.I guess it really doesn't matter now.