On this site we call that Dream Sharing or Shared Lucids. (sure there are a couple other names use too)
Some here believe it is possible some are skeptics. I believe it could be possible. I'm openminded

Here some threads you may find interesting
http://www.dreamviews.com/forum/viewtopic....t=dream+sharing

and

http://www.dreamviews.com/forum/viewtopic.php?t=8260