Not sure if that is what you mean here, but when I was in University I started taking speed to try and keep up with studying despite my ADHD/depression.

And not just a bit either, but quite a lot and I must have overdone it and stayed up too many nights in a row once. I remember trying to go through my day, while I constantly spotted what could only be described as "shadow people", whenever I tried to directly look at them they would be gone, but then I‘d see it again just near the edges of my field of view. It was one very creepy day and what led to me finally admitting I can‘t do it anymore.

So I ended up dropping out, found a job in IT and got therapy and some more reasonable ADHD meds too. Still, I imagine that is what being schizophrenic might be like and I did not enjoy that at all.