Dreams

I've talked about the concept of dreaming with others and I just can't come to grips with it. I think the issue is dreams and spirituality where I get caught up. One question that has been posed to and has really resonated is, "you know that time in between dreams where nothing happens or those nights where you don't dream at all? What happens there?".
I had a dream last night, and at one point, I fell asleep in the dream. What happened to my mind there? did it automatically jump to the next part of the dream or did it do nothing for a while?