One of my friends "dreamt" that she was in a fight with a Jaguar and that she was a warrior of some sort. At one point the jaguar threw her against a rock and she felt her arm hit it so hard she could hardly move it. When she woke up it was bruised. That's not the interesting part.
She was telling me about it at my house and when I got up to get us some drinks I heard "holy s**t!" I came back and she had picked up one of my books and apparently opened it onto a picture of....you guessed it, a warrior hunting a giant jaguar.
Obviously there was either a message in this, or she was actually doing this in dream time and they (guides, guardians, etc.) were trying to validate that it was a real experience.
I have also been told that there are some people that will go back and actually experience past lives in dream time. and that its lucid. I do believe we can exist in different places, so I buy that, but I don't know anyone who has actually had that experience.