Yep, I was a chronic insomniac. During the worst period (about 15-18yo) I had a few times where I'd start seeing things, getting paranoid or just generally real

Yep, I was a chronic insomniac. During the worst period (about 15-18yo) I had a few times where I'd start seeing things, getting paranoid or just generally really disordered thought pattern. If you generally sleep well, then the occasional period of 48 hours of wakefulness is probably fine, but chronic lack of sleep (whatever that constitutes for you) can really mess with your brain.