Sylare said:
i was playing Fallout: New Vegas in my head
What do you mean "playing" ?
It's so subjective. If you were thinking about playing the game, or visualizing the gameplay - then that's all normal.
Let's do a thought experiment. I'm going to assume you can swim and you know what it's like. Now close your eyes and imagine yourself swimming. Now imagine fallout new vegas playing.
It's perfectly normal.
So is dreaming about games you play alot. That's what the mind does when it's asleep, it goes over stuff and moves it around in your head.
Now if what's happening is that you are seeing this stuff mixed in with the world around you, as in hallucinating, or genuinely thinking that you are in the game world or somewhere where you are not. Then this is not normal, and it's probably an indication of some kind of medical problem (not related to the game directly). In that case I would suggest you book an appointment with your GP.
That's very unlikely however, so don't be alarmed =P