I've had a few recently, and one thing surprises me about all of them-
There is never a single other person there. Ever!
For example, yesterday I remember a dream in which I'l walking down my street in Autumn (Lots of foilage around here) and for some reason I think Ding! I'm dreaming! A reality check confirms this, and I jog down the street looking for someone to kick in the nuts. But...
Nothing. Nary a soul anywhere.
No problem, I think. I'll make someone.
Nope! Control hasn't ever worked in my LD's.

I really don't understand it. Why isn't there anyone else in my dreams?