If I play starcraft 2 before bed, basically all my dreams are about the game, and running through strategies xD (It gets annoying sometimes...)
Though i have never tried it, that could be a dream sign if you have the same thing.

Slightly related, myself and a couple other members of DV are making a 3D video game that will help induce lucidity with optional in game subconscious cues, as well as just being a cool game