narcolepsy
"I can't take Provigil daily because it is expensive so I use it on days when I need to accomplish important tasks (shopping, housework, social occasions, etc.).
Having suffered from depression since my teens, and although my standard medicines help, Provigil is the only medicine ever that has made me feel "good". I'm so happy my psychiatrist suggested this medication and I hope that it is approved for depression so that insurance companies will cover it."