I'm glad this thread is posted because I've been wondering this about myself.

I call it 'the trance' but I often stare off/daydream etc. and get lost in tv shows, conversations, etc. Many times I need to drive and listen to music...have called that music therapy.

I've done this ever since I was little...I do have ADD but think this goes beyond ADD. I have driven to work and thought, hey I don't remember being this far...but I must've been present enough to drive.

Actually since taking Neurontin and Seroquel I don't zone out as much as I used to. As for whether this is part of BPD, I couldn't say for sure. I also have PTSD among some other lovely personality traits

I guess I thought it was part of the PTSD...