It's a bit too late to verify it more but when i was younger and first got into all this stuff, I met a woman who was heavily into LDing and Astral Projecting and the like. She had hypermobility syndrome which, i found out later, tends to cause a lot of Lucid dreaming. I wanted to test her Astral Projecting to verify it but never got round to it.
anyway, one night we were in bed together, drifting off to sleap when I entered into an odd dream. I'd been Lucid dreaming on occasion (though it wasn't a priority for me at the time). this dream was like being in a dark cloud with no gravity and nothing solid around. i had awareness of my body but couldn't really see anything much. This woman was there with me and I was aware of her but not in a visual way and yet i could see her. we embraced and she told me that she was my mother - this totally freaked me out because I thought it was something she would never say to me and i thought then that maybe it wasn't her but a creature trying to get my energy. I caused us to spin round rapidly in the air as if to make the centrafugal force seperate us and then woke up. She asked me then why I did that and when i told her that when she said she was my mother that I thought it wasn't her, she replyed that she was saying it to try and put me in a more secure state.
We didn't realy go over the subject again as our attentions were more on manipulating energy in the waking world and self awareness. At the time it didn't seem like anything more out of the ordinary than anything else we were doing but there you go.
I can't really say if we were in the same dream even though it appeared that way as I've found that the more aware of all the possiblilities I've become, the more doubtfull i am about what's going on.
I have to admit that when i found this sight, I though there'd be people on here who are really quite advanced in their practices and I'm a bit amazed that dreaming together is such an uncommon accurrence but maybe that's because, if you can do all that stuff with no problem, why would you be looking for this site?

food for thought.