I've been taking Provigil for a couple of weeks. So far, I've discovered it's like a diet-pill in terms of appitite suppressant and energy boost. I've been taking it about 6pm since I work 3rd shift. Thurs I was unable to wake up normally. I usually sleep from 8-3. Thurs I slept from 8:30-6:30pm. Then I had to take it as soon as I woke up. I don't like being that dependent upon a stimulant drug. I've cut down to 1/2 pill since I got it. I really HATE being sick and tired with CFS and Fibro!!!!! Betty J