Strange reading this, as I had a few dream states where I knew I was awake, but my dreams continued, and like you experienced, I had some control, and I knew I was controlling it, to my script. It happened more than once, and always in the morning when I woke up.

I've got to try some plantain chips.

One think I learned from Dr. Michael Ruscio's Healthy Gut, Healthy You, which is all about the gut microbiome, is that if you have other health problems, maybe you should avoid prebiotics, as you could have SIBO (small intestine bacteria overgrowth) - that this could exasperate the situation.