One of the first times I did heroin, I went and meditated cause I just didn't know what to do with myself, and the strangest thing happend. I was just sitting there meditating and I felt like I had been there for a really long time so I finally opened my eyes and just kinda looked around, enjoying the serenity of it all. My wife came in and I briefly talked to her about whatever, and she said something that was out of place in the conversation. I asked her "what?" and just then I woke up. I had fallen asleep sitting straight up deep in meditation without even noticing any sort of mental shift whatsoever! Usually I can feel myself nodding or starting to fall-out but this was so smooth and strange because everything looked the same.
Another time my roommate had been doing morphine base for days and days, and I think some H too, and he told me that while he was walking down the hall he turned and saw a woman standing in our hallway who looked like she was made of smoke, and floating. He could only very subtly see her. He's convinced it was a ghost, i think it was from the morphine base. Didn't DeQuincy say something about opium visions or something that he had from drinking laudenum back in the day? I could be wrong... but this is very interesting IMO