Individual with ADHD and Borderline here. It's a very dangerous thing to forget how fatigued you are with ADHD, just continue staying awake and then slowly drifting into a state of sleep deprivation which apparently activates the "on a thin line between sane and absolutely gone" mode. Before I was self aware with my BPD I used to get really scared of being in that state, nowadays I just vibe and see what stories my unconscious makes up. They can go from being outside and thinking Michael Myers is standing around a corner (I play DBD a lot) to staring at my eyes in a mirror because I just get lost in them. (windows to the soul and all) It's also always exciting to test my paranoia with sticking my foot out from under my cover. I've come a long way from hiding away from these thoughts and episodes, to full on testing how far I can push myself and my imagination. Shadows used to freak me out in every way possible, now I just let the Boogeyman watch me sleep, most of the time, if I haven't watched a particularly scary movie/show that day because media, depending on which genre, completely influences me. So yeah, if you wanna test hallucinating from lack of sleep for the first time, don't watch Gerald's Game or something. (I didn't sleep the night)