I love reading the trip reports on Erowid:
I literally feel like this could be the case for me. I'm unable to lucid dream because even if I go into it knowing it's going to be a dream, hell even if I go into a daydream, my brain will instantly realize it's seeing or experiencing something and assert that it's reality and there's no need to question it because it is certainly real.
It's so annoying because it affects more than just dreaming, it also makes it impossible for other people to convince me that any of my memories are even slightly embellished.
(Drugs only give you a different experience!)