I sure don't know, but it seems like something to definitely explore. I can say that the worst of my maladaptive daydreaming, and the worst of my depersonalization/derealization occurred at basically the same time. It started during a particularly rough period in my attempts for recovery. In my case, it all started after my long string of hospitalizations, after my disability started, and while I was struggling to avoid additional hospitalizations. In my case, doctors even suspected that I was having simple partial seizures (sensory and psychic). I was having hallucinations (visual and auditory), but I think mine were more from dissociation at that time, more than actual psychosis from my bipolar disorder, which I had also experienced in the past. I even had some brief dissociative amnesia (seconds to minutes). Amnesia (or blackouts when conscious) experiences were present during my most severe manic and manic w/mixed features episodes (mostly with psychosis). In the case of maladaptive daydreaming, sometimes the "story" becomes so intense that the outside world ceases to exist. I stopped seeing and hearing the things in the immediate/actual environment I was in. Again, sometimes for hours, rather than seconds or minutes. I could wander as if I could see (not bumping into things), but in my head was a totally different scene.

Journal articles have been written on related subject:

Is risk for mania associated with increased daydreaming as a form of mental imagery? | Request PDF

From the article at Differences in coping strategies in adult patients with bipolar disorder and their first-degree relatives in comparison to healthy controls
"The greater use of maladaptive strategies by patients than by controls may be associated with the cognitive deterioration that can occur in bipolar patients with long disease duration and recurrent episodes. 31 Coping strategies are dependent on the integrity of executive function, and a long-lasting disease process can lead to the ineffective use of coping strategies and consequent adoption of mechanisms that are less effective for the management of stressful situations...The more frequent use by the patients of strategies such as...self-distraction (mental disengagement from the objective with which the stressor is interfering, through daydreaming,...indicates a reduced capacity to manage adverse situations that may be related to cognitive deterioration caused by disease duration."