So I've got a new RPG character who's a mutant and a narcoleptic. In canon, she's rich and sleeping with a doctor, and he makes her a drug to keep her awake, which she winds up being kind of addicted to. The thing is, in the RPG, she's pretty much broke and never met the doctor, so I need a new drug for her to become dependent on. I was thinking maybe speed, but I was wondering if anyone had any other suggestions? It needs to be something available on the street, something that could keep her awake for a really long time (some kind of upper), and I don't want it to be anything ridiculously addictive or harmful like heroin.