I only have had a few j-rocker dreams, and they're all not that exciting.. In one dream, there was this huge swimming pool, and all the people in my former school were in the pool. A friend and I were just paddling around in the water, trying to stay afloat, when I noticed that Gazette was playing on a stage right by the pool. What made the dream weirder was that the members didn't look like they normally do, different faces. End of dream.
And in another dream, I was walking around a large city (tokyo, maybe?) when I found a back alley type thing, and it was very clean and had a bench sitting in front of this door. I sat down on the bench, and saw that the door was open. For the rest of the dream, I would see different members of Gazette, and sometimes a crew member, walk by the door. And I just sat there. I didn't bother getting up and going into the door to see what was going on.
So yeah, my dreams are boring, no interaction with the members. I do dream vividly almost every night, but rarely about people in the entertainment industry.
And about fanmail.... I'm not a fanmail type of girl, I don't know what to write, but one day I was bored, and decided to send a fanmail to Ruki. Well, after I sent it, some male voice screamed "ARIGATOU!" That scared me so badly, since I was home alone with the lights off. I was thinking "Who's there??!?" Then I realized it was the voice recording, and I had my speakers up too loud...