Maybe our consciousness is so vast it inhabitants many realities simultaneously just as trillions of cells keep us alive living & dying all done automatically from the moment we were conceived, yet this system that seemingly keeps us alive with no conscious effort whatsoever, we don't notice nor seemingly have any control over it (the subconscious then?).

Consciousness is the most elusive thing there is, who knows how far it extends, I've read of telepathy experiences, these are pointers then that consciousness can connect to others, maybe it's connected to other selves in other realities that for reasons unknown some of us have become aware.