When there is nothing to desire, there is nothing to dream about either, because dreams are reflections of your desires. Dreams are reflections of your frustrations, dreams are reflections of your repressions, dreams reflect your day-life.
Meditation is object-less. If you use any object, then it is not meditation; it becomes thinking. It becomes contemplation; it becomes reflection, but not meditation. This is the most essential point to be understood. This is the essence of a meditative state: that it is object-less. Only consciousness is there, but not conscious ABOUT anything. Consciousness without being conscious of anything - this is the nature of meditation.