Thats a common being as if you play a game for too long in a short period parts of the vid screen start to burn into your color receptors in the back of your eye and your brain starts to absorb it in more and retain that image. Kinda if you have a image on a MONITOR for too long it burns a after image into it.
i've had several dreams where i'm with fun people and sucha and i need to speak out and say something but i can't my mouth is open and i keep trying to speak but no sound comes out..
I remember my last one even though it feels like it went on for hours on end but it actually was like ten minute dream as well as very vivid and descriptive in everything happened. It wasn't sad or tragic at all which is kinda odd but i'm not goign to think much about it as it was one of those dreams where sometimes they don't hold much water.