A few. I once dreamt I was playing the mountain highway hostage rescue mission from Rainbow 6: Raven Shield, and at the end of long sloping hallway after the stairs going down was a hole in the wall near the roof with some robot monster thing in it. I was having trouble killing it, and wasn't sure if I changed to one of the other fireteams PoV I could get there before the small team I was leading got killed on computer control.
Also, playing SWAT 4, in weird awesome levels only existing in my head.
A weirder case, I dreamt a bit in Exile 3, when if you wait in combar mode long enough wandering monsters can appear, which wasn't the case. Much later that actually happened (well, in Exile 4, which is almost identical in gameplay)...either I'm psychic, of I'd forgotten about it and just thought I'd dreamt that feature up.