I had this happen to me with one of my lucid dreams. In it, I had wandered away from a party and upon wanting to return, a voice in my head convinced me otherwise. It felt both separate in the way that I couldn't identify myself with it, yet familiar in that it was definitely my voice talking to me, although my presence was most definitely within my dream body and not, that disembodied voice. And there was something about this voice that made it so trustworthy. I listened until it convinced me that it was all a dream, but once lucid the voice was gone. I never thought anything of it and chalked it up to the usual quirkiness of dreams.

The thing is, the mind has a way of playing with perspectives in a dream. Consider how sometimes the situation reverses and you become that disembodied voice or presence that watches or listens to a dream character that represents your very self. This happens many times during my non-lucid dreams. Sometimes I occupy the dream in mind alone, and while not participating directly with what's happening, I can observe a different me, a more visceral me, that lives and experiences the dream. Both are different and feel very personal. It's like I exist two times within the dream.

At times I think it is the mind expressing all this daytime practice into the dream. Today it is a voice inside your head that guides you, tomorrow it is a dream character, and the rest may all come through your own reasoning. Still, there was something to this voice that made it stand out. Usually whatever message the dream is trying to convey (e.g. that it is a dream) is a lot harder to grasp, unlike this voice which was more upfront about things, more direct. Could it be that the frankness of this voice in your dream made it a lot more personal to you, in a way for it to stick out among other dreams? Say, would you've felt the same if it was another dream character referencing the same things like this voice, without necessarily speaking to you directly?