I mean dream in the most general sense. Be it a “dream at night” type dream or a fiction-induced dream (movie, book, videogame).
Any time you are entering a body of assumptions about reality, I guess. Or an “artificial way of seeing”. How do you exit that?
The meditation answer (that I alluded to there in the text) is to carefully watch your world and yourself and catch yourself “choosing to dream”, then stop doing that. (which is easy enough with movies, more difficult in other cases, etc)