i would just like to ask one thing have all your shared dreams been lucid?
i personally ,and i am not lying, or trying to brag ,and yes i am willing to prove it, have had 3 shared dreams.one was with three other people and was the most spectacular in the sense of me being amazed that it could happen.we were all very close friends in high school and into many of the same things.another was with my little brother and another was with this girl in school that i had felt sorry for ,for a long time in school because she was annoying and didn't have any friends that i had recently made friends with.
in trying to prove it in a lab the person you would share it with would have to be trust worthy and both of you would have to be credible to be taken seriously because most people are of the opinion that shared dreams can not exist.