Coffee (or caffeine) is probably the most notable drink or recourse you can get to stay awake. People who have to extend their working hours or simply want to be awake most of the time consume coffee to keep their eyes open.
However, health risks have been associated with too much caffeine. It is logical in the sense that you may be abusing your body in a sense. Further, it seems that too much caffeine can lead to hallucinations as found by this study from Durham
