A Most Complex Encounter (Whitley Strieber)
Then I was in bed again, and aware that I was asleep, and not only that but I was dreaming about the lives of five different Whitley Striebers unfolding in five parallel universes at the same time, one of which was the one I was in.
While this was happening, the five of them were distinct, and I was inside five different selves at once. There was no confusion, and I wasn't on the outside looking in. I was in these lives, living them, all at the same time. I wasn't in the least confused by this. It seemed extraordinary, of course, but also perfectly possible.