In a 2010 study of psychedelic users, 23.9%[verification needed] reported constant HPPD-like effects, though only 4.2% considered seeking treatment due to the severity.[58] In a 2022 double-blind, placebo-controlled study, 142 subjects received LSD, psilocybin, or both, reported no cases of HPPD, and up to 9.2% of the subjects had flashbacks which were "transient, mostly experienced as benign and did not impair daily life".[
I had HPPD for around a week after my first LSD trip. Or maybe HPP, if it's not disordered? It was pleasant and positive. After a few more trips, it appears that now it comes back, even months later, but only if I don't sleep for too long. Makes it hard to sleep at that point because I won't want to go back to normal... hehe.
I learned my lesson when my digestive system noped out after being awake for 72 hours straight. First time in years I've ever nearly thrown up. Would not recommend.
