I don’t think I’ve had this experience before. I was inside a dream (non-lucid) talking to someone in a room where there was a bed. At some point in the conversation, I decided I was tired enough that I wanted to lie down and go to sleep. As I did, I started to experience the same feelings plunging into darkness in hopes of finding my way to a lucid dream. I finally did “breakthrough” and enter into a lucid dream briefly.
In this dream within a dream, I was crawling around what looked like the underside of a house, but really must have been the basement of my mind. The strangest part to me is that when I woke from the lucid dream, the woman I had been talking to (a friend from high school) was still there and I didn’t realize that this was a dream to. To recap, regular dream, the lucid dream within the dream, the back to the same original dream. This is very unlikely given how unstable the dream world is. I also find it amusing that I recognized one layer of dreams, but not the second.
I wonder if anyone else has had dream within the dreams and what their experience was. Let me know!