I just had an idea when u dream girls or anyother persons you want to talk to in real life. Ask them if they have any IM ID (yahoo, msn, icq, etc) and request their IDs. When u wake up add the im ID fast so you won't forget it and see if it works (or is it real). Also if it's real (god knows what might happen ) ask for some pics with her/him and check if she's/he's the one you saw in your dream...

I never tried this, but i'll surely do this in my next LD (if it'll happen).

How did i came up with this idea? It happened to me in a normal dream, a girl gave me her Y! ID, but unfortunately i forgot it before i log in... pity