I subscribe to the Multiplicity of Personality theory (our personalities are a combination of multiple ones). eg My wife and I both have a chaos monkey that emits impulses to do the most destructive and disruptive things, which we sometimes talk about in jest.

My dominant personality is one of control (for order) so I can focus on problem solving. Some sort of raw insight/intelligence comes from a personality that isn't always on, but seems to erupt from periods of calm and relaxation. eg Shower solutions or bedtime revelations are common.

Many people have told stories of voices that nudge them this way or that at just the right time, which I've experienced as well. Whatever part of me dreams is uses memories and fantasy, striving to experiencing new scenarios through thought experiments. The better I sleep, the more I find very recent events are incorporated...so it's some sort of shared space and speaks to how physical state affects mental states, even in sleep. I also feel like the personalities fight for dominance when the body or mind is overly-stressed (puberty, mortal danger, etc) but normally resolve into a sort of basal state.

I never wanted to be a psychologist. I often think that maybe I'm just crazy. It would explain a lot.

  > I often think that maybe I'm just crazy.