> very “non-euclidean” every time. The laws of physics were not obeyed, and the hallucinations are a lot scarier than goofy little people falling over themselves.

I've never had benadryl hallucinations, or anything of the sort, but I have had quite a few very high fevers that resulted in very similar dreams and hallucinations - and I have zero desire to repeat them, to the point where I'll often delay going to sleep if I have a fever.