So, I speculated on it in the Slog thread, but I have a feeling that one thing that has perpetually thrown me off about the Dreams is thinking they are either true or false within themselves. As in, the "normal dreams" are true and Akka's "changed dreams" are false. Or, the "normal dreams" false and Akka's are true.
In reality, it could most certainly be that all the dreams are false. They are all propaganda, viramsata. The lies in the "normal dreams" are to keep the Mandate on the straight and narrow, while the lies given to Akka are to guide him on his "mission" (whatever that is).
I do think that there is some truth interspersed in there too, just to make it that much more unclear as to if we are to believe them wholesale, or not.