I don't think science will be able to say as much on the subject as one would like. "Navigating your own dream state" is a person making decisions about a world they themselves have created. There isn't much room for an objective observer there. In general, I don't think science is ever going to get a grip on consciousness. The whole "self observing the self" business makes it way too slippery a concept to get a grasp on in any satisfactory manor.