I can write a book on how this completely has been affecting my life for years and years...
only since I found PC, was I able to hear of other people experiencing such things.
Im not sure what it is *exactly* but I have parts that are
-very academically/work competent and responsible
-some reckless
- a child

lots of more stuff but when I switch to them...I dont feel like its just "me being childish" because....I actually do childish things like sit there with a blanket and watch kid shows...and a few hours later I could be like "what? I would NEVER EVER DO THAT EWW"...
I mean one thing is acting a certain way and knowing its just something you felt like doing...and another thing is not relating at all to why /how/what was the purpose why you did those things...

It drives me crazy on a daily basis..
I dont know if this is what you are talking about?

sorry if I was no help!