Last time I had a dream about a game it was FF7 oddly enough. I was Cloud during the escape from Midgar scene with SHINRA chasing us down on bikes. Except in my dream they had automatic weapons and it was way more hectic. I ended up nearly dying but luckily Aeris used a Pheonix Down on me.

And on that note, I still hate Sephiroth. Jerk.

I dreamed about the Bioshock 2 Multiplayer before it came out.
And before we knew any details about except that it was going to be in Bioshock 2
It was actually pretty accurate to the real version the only difference was that the level I dreamed about does not exist.