One eastern view of this spontaneous arising in consciousness is called maya, the grand illusion. In this view everything is considered to be illusion, hypnotism, just as dreams are illusion, or just as people, who are awake, can be hypnotized to see things which aren't there.
The dream which has arisen is an incredible saga of millions of "souls" reincarnating through millions of lives, in millions of bodies, creating and dealing with karma, and slowly, slowly, raising their consciousness until, one by one, they realize that they are not the individual consciousness they are identified with, but, rather, the universal consciousness in which the maya has appeared.
In this view no thing has reality. All the input through
our senses (including our thoughts) is hypnosis, hallucination.
The only reality is the one, constant, never-changing, eternal,