narcolepsy
"I have taken Adderall XR for YEARS now.  I have MS & as a result have hypersomnia, which is very similar to narcolepsy.  For years & years, I took Provigil alone for this & it was great.  But eventually, Provigil was no longer enough to keep me awake.  My doctor tried me on Adderall XR & it was amazing.  I was able to stay awake ALL day long & felt great.  I never had any real jitteriness.  It does make me have almost no appetite at all, ever.  Mostly I just don't think about eating, it doesn't really occur to me & when I do eat, I can't eat much.  But, having been obese most of my life...this hasn't exactly been a problem!  "