This is a big topic and difficult to explain unless one has facility with the various planes of existence.
First: We are all communicating on the physical plane with shared experience mediated by the physical body and its senses. For most people who are not rigorous, self-aware contemplatives who have facility with deep mediation, then these people become unconscious when they sleep. Sometimes they recall a dream. The dream-scape is the lowest levels of the immaterial domains.
When one first develops sufficient depth in meditation that they begin to travel out of body they leave the body and move on the lowest levels of the immaterial domains. Here they interact with beings who are either dead, or dreaming, so these beings have no self-awareness, and are essentially wondering spirits who are prone to demonic behavior.
People who leave their body and enter this lower domain often report being ganged up on and even chased. The reason for this is the wandering spirit becomes terrified of the self-aware being. At this time the self-aware person who is new to being out of body will often become frightened and experience sleep paralysis, and eventually struggle enough to force oneself back to the body.
As one's contemplative life deepens one develops facility in the immaterial domains and learns to move freely in the immaterial domains, so when the wandering spirits and hungry ghosts become full of wrath one simply rises up above the lower domains to higher domains of kinder spirits.
As one deepens in skillful meditation one sheds the layers of identity shedding ego and body and other aspects of self rising to higher domains where there is greater bliss, joy and ecstasy. Eventually one just becomes a point of light, awareness and love. At this point one has become part of the heavenly host, which is a vast, and infinite expanse of points of light, like space full of stars. And, when one then embraces the wholeness of the heavenly host, then one becomes god, and all of those points of light are the many cells of ones organism.