@Lady Rain
You must be knowing that playing a lot can have psychological effects on you, and you should be alarmed if you start having nightmares. Be warned if you really care <img src="/ubbthreads/images/graemlins/evilgrin1.gif" alt="" /> (It is highly likely that people around you would already have told you these things by now) <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />
I experianced "such unusual" things when I played DD. When I blinked my eyes, I could see the game for a moment... with music.
Talking about music... DD's music does not leave that kind of an effect as compared to BD. The best music I have ever heard in a game was in Return to Castle Wolfenstein. This has been acknowledged by two of my other friends. One of them finds the music scary and recommended me not to play a particular section of the game in night! <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />