I am calling focus in this instance PMR and NPMR. Within Tom's MBT he does the same thing. You have to call it something :). I am saying that it's a logical impossibility for NPMR and PMR to be separate and the same all at the same time or you could not logically say I am shifting my focus from "here" to "there".
Waking life and classic dreams therefor seem to share the same "focus or perspective" which happens to be PMR.
My interpretation would be that you are bringing your experience only of the migrane/aura/poisoning with you to your dreams. One is not filtering the other, one is not more physical or more fundamental than the other.
This implies that I created the sense of the migraine as I have in the past with sight and hearing when obe. This is not what happened. A real migraine started in the dream and then continued into waking, which suggests that it "exists objectively".
I disagree with your perspective. I think SS contributed with his assumption that dreams relate to the physical. It is our interpretation and focus that bring us closer or further from PMR. The fact that PMR affects the data streams we process, does not mean or proved that they are "created" exclusively by PMR. PMR may give a starting direction, but the final driving depends on each of our different capacities to process information. Dreams are NPMR as any other NPMR experience (like OBE). You cannot catalog objectively. Dreams and OBE are affected by the subjective. If you are aware that they both are information, the main difference is in the awareness itself. If you are perfectly aware in a dream and relate to the physical you can catalog it as an OBE, but that again is an interpretation. My perspective is more in tune with what Sainbury and Steve posted. PMR is like a woman. You can get more or less attached to, but if you practice and experience more NPMR you can easily get less attached to PMR if you want to. There is no general rule for all. It depends on your interpretation and your present capacity to control data streams.
NPMR and PMR are sets of data streams. You, we are always in both. It is our awareness that can allow us to not only experience more NPMR but also parallel process more. It is not an either or. It is easier to experience NPMR the farther you get away from PMR, but with practice and if you can lower your entropy you can parallel process more and experience more NPMR without sacrificing much of your PMR perception.
What you called focus can also be named awareness.
BTW: I totally agree with Steve.