Derealization, I believe - not depersonalization? Believing everything around you to be made up - perhaps even by yourself in some cases. Feel free to correct me if I'm wrong, just trying to make sure I have the terminology correct
For example when you get very aroused your pupils dilate. Your brain fixes this for you so you don't feel like more light is hitting your retina even though it does.
When you are high on psychedelics you can experience this though as the world getting literally brighter and darker with your mood. Feels like you are shaping reality with your feelings? As soon as the drugs wear off the effect is gone but you still have the memory that it happened.
Weirdly enough, the same way dreams can feel more like an episodic story or more like an immediate experience, that unfiltered dreamlike experience feels more real than the rest of the trip. Maybe because it literally is closer to reality because it was less bring-filtered, or maybe because the contrast between this and the hallucinations of wallpaper shifting before your eyes put the search for "real reality" into your head in the first place, now the concept of more or less reality is in your brain as an experiential concept. Now you have the memory of having struggled for real perception and achieving it.
Like in inception: you fell into a dream, you are trapped for longer than you anticipated and don't like it and want to wake up. Weeks later when you have a deja vu it triggers the uncomfortable feeling that your mind is playing tricks on you. Are you dreaming now?
Though this is not schizophrenic. From what I was told from someone who had schizophrenic episodes it makes you completely unable to tell apart illusions from reality.
