I've had some dreams like that - a few dreams were specifically of the game Supreme Commander, and I also occasionally am in third-person in dreams as if I was watching from the screen of a third-person game - I don't think it's really "very different from real life", it's close to the experience of being immersed in a videogame, it's just that rather than overlooking details you're not paying attention to, those details simply don't exist because it's a dream.