Heh, this reminded me of something.
Dad was doing a little truck driving back in the early sixties, and folks were still innocent enough they didn't think of Bennies as a "drug". So another driver gives my Dad a few and tells them these are to keep you awake, that sounds just fine to him.
Well, he was somewhere, God-know-where, in the Panhandle of Texas when he starts to feel pretty drowsy. So he takes ones. In a little while, he starts to feel drowsy again, so he takes another. As he tells it, he is driving along just fine and wide awake on this empty two lane highway, when suddenly out of the darkness he sees an old-fashioned steam train coming directly at him, just as clear as day...he can see the cow-catcher, he can see the lantern, he can see the number on the thing...coming at him head-on on the darn highway, in his lane! He pulls off on the side and shuts her down in a hurry! Of course there wasn't even any railroad track within sight anywhere around.
Needless to say after than incident my Dad sticks strictly to the java for a pick-me-up.