Before I had this last baby, I would wake in the mornings and say "Open" and "I can do this" I never intended to wake up and say these things, they just came from my mouth. Lo and behold, while in labo I chanted "open" over and over and "gentle" while pushing (not really pushing so much as letting my body push). In my head I said a lot of things like "open", "gentle", "power", "surrender". I beleive at one point I was saying "surrender" in my head but what came from my mouth was very loud and memorable "SH**!!!"
I'm told that at some point I was telling myself "no no...YES YES" and I do remember saying that in my head, I guess I said it aloud too.
With my other two births.... For my first, really nothing ran through my head. I remmeber telling myself that I could do it and that it was fun
With my second I did a lot of going inside but not really thinking. I imagined ocean waves and riding them and I didn't really say much aloud or in my head.