Dreams are the supreme examples of the nature of reality--they appear, but do not exist. Yet due to their appearance, we feel, we react, sometimes we even "make decisions" and carry out actions based on the experience we've had. Often when we wake from an intense dream experience we are emotionally, and even physically, "affected" by the experience...and yet that experience has been entirely "fabricated" by mind.
The teachings of "Dream Yoga" in Tibetan Buddhism, for example Naropa's Six Yogas, are not primarily concerned with the "meaning" of dreams, or their "analysis" or "symbolism," as in Western psychoanalytic theory or any sort of "New Age Dream Interpretation." Though it is true that dreams are sometimes seen as foretelling.....
More important is the idea that the very nature of dreams is realized....that, in fact, the first step in Dream Yoga is the realization that one is dreaming--this is called "seizing the dream." Beyond that, it's not an appropriate topic for public discussion. Let's just say "lucid dreaming" is a better analogy in Western terms than "dream interpretation."
I have also heard that dreaming of Lamas, Buddhas, etc., can be somehow a "negative" experience, though it may seem otherwise.