Worth to mention that there is a condition called HPPD (hallucinogen-induced perception disorder), causing people to see CEVs/OEVs while not on drugs. The condition persists for a while (for some people, months or even years) after a drug use, as the name would imply, causing annoyance and anxiety.

Surely its a spectrum, but seeing closed eye visuals isn't considered "being in a normal part of the spectrum" though.