I have had similar experiences while dreaming actually. A certain belief that what I'm experiencing is more like being an observer in someone else's body/mind than a made up situation my mind created from nowhere.
Similar are opiate dreams, where one can feel their conciousness "shift" to what seems to be OOBE, but for me they are more like (sometimes anyway) watching through someone else's eyes for just a few short seconds.
I think this because the experiences are of such mundane events. It's not spiritual or fantasy, it's things like going through a convenience store or talking with someone at a table. Also, it has a different signature than the fantasy of deep dreaming, where the events at some point take on unreal qualities. In these conciousness-overlaps, it's random clips of someone else's life (or seems that way) from a very first-person perspective.
Of course, I'm speaking of opiate induced dreaming or natural dreaming experiences that are very similar. Never been like that with dmt.