narcolepsy
"Aderrall has really helped me stay alert and concentrate, as I have chronic pain issues which leave me sleepy and unfocused.  I have the energy to enjoy life again.  I do have difficulty sleeping, and also since I do not take XR can "crush" it  if I forget my second dose. I have noticed it makes me most irritable and difficult to be around.  This side effect seems to have waned over time, but I am still occasionally cranky when it wears off."