It would not be a “type” of yoga as your text states. But I would agree that it, in conjunction with other things can “BE” yoga. All things are yoga (technically) yet what we have to watch out for there is the opposite swing of the pendulum such that we use “all things are yoga” as a cop out or avoidance.
Relative to the dreaming, I think more information is warranted before going further. Obviously late night eating habits tend to stimulate vivid dreaming. I suppose if it were a piercing read, as Georg can be, it could release something in the sub-conscious mind.