People use them as nurses, too. I can't have caffeine at all (but I'll cheat and have tea when I'm off). There are people on my unit that work crazy shifts including very far driving and have a lot of kids so I don't know how they do it without insane amounts of SOMETHING. Someone left a pencil box at the desk and I was looking through it to see whose it was and it had Adderall in it along w/ caffeine pills and an assortment of other stuff. Interesting. Me, I just drag butt and try to sleep as much as possible between shifts.