Nice post! I've been thinking about that as well, but I came to the conclusion that my dreams are so strange and also directly affected by my waking life, so it's highly unlikely that they would be real and happening in some other life. I also do lucid dream every now and then. Some dreams do feel very real how ever, but they are often even more affected by my waking life. It's a interesting theory though and something that I like to think about every now and then. :)