I know this is selfishbut uWandering inmate252 describes a state that someone is in immersed within dreams or mental escapism. Such experience could occur due to boredom, lack of interest in their present circumstances, or a desire to psychologically transport themselves into another reality.
Daydreaming can vary from light to deep condition, and it permits the person to explore an imaginary universe of their personal creation, unrestricted by restraints.