Few days ago I had a dream where I was talking with somebody about dreams in general. In a dream I had this crazy theory that when we dream we are actually seeing life through the eyes of those that are awaken and when we are awake they are asleep and they see life through our eyes.
This theory comes in conflict with lucid dreaming, but doesn’t matter, just thought to post here because it’s very fascinating theory, at least to me!
Cheers! 
That seems pretty weird and could become a nice Cloud topic.
But, if you claim that someone is seeing or playing the role of another person, then both maybe only one person timesharing their bodies/realities.
Still, it is probably not possible to do so in our current reality and maybe the person from an alternate reality who dreams about people in this one wouldn’t be able to LD.
Not quite like playing/having control more like passively observing and not able to do a thing, like I said it’s could work if we don’t know about lucid dreaming: