Thank you both for your replies, this lets me go ahead and share this:

Spoiler for Dream-like but fully awake experience:


This is from an entry in my DJ (be sure to read the comments) from a while back now and I thought I remembered ZAD commenting on it.

Even though it was almost two full years ago now, I still remember that to me this experience felt like what you two are describing here and it was certainly very interesting, but because it feels a bit specific in what I require to recreate the experience, I often can't find the time to dedicate myself to doing it or when I've had the time, I've unfortunately had interruptions and such like. I'm likely to try again at some point soon anyway because a few things have changed for me recently, and so it may feel easier (or not) now.