I haven't ever seen the "void" but I've approached it at least a few times while awake. Once was when I was in a band class and we were led through a visualization that could easily have turned into hypnosis. I was sitting in the chair and felt myself about to "fall" or "sink" into some emptiness or void, but I jerked back from it. The second time was with a LDing self-hypnosis mp3. I was relaxing progressively and at one point felt myself about to slip into the void again, but once again jerked back. It's that feeling when you're about to fall asleep but you think someone is about to touch you or you're about to step down and then you jerk (I'm overusing the term...) awake.

I'm more interested in that room you were in. It seems like a place that enhanced your control over the dreamscape and I'd be interested to see if you could return there and have the same level of control as before. It might be worth finding out.