Some of my dreams are lucid, and i actually do not dream a lot. Sometimes things happen after i dream and more often than not, it is a sign of something happening or that something will happen. There was actually a few times where I dreamt of my own Lama in a number of different ways. My dreams about my Lama are always extremely lucid. Some of them are quite auspicious, while some of them were not auspicious and were actually a sneak preview of what is to come. The sad part is sometimes it always happens in the way where the situation turns out to be what the dream has indicated and nothing can be done about it prior to the dream. Lucid dreams can come in 2 forms: it's either that it is a result of having very strong craving for something until it gets stuck in the mind to the point that it dominates the mind, basically, the will of the dreamer, and a dream where the protector or a Buddha shows signs. People who are often in denial have many and continuous dreams non stop because they are suppressing what they know is wrong but they wish to believe that it is right despite everything telling them that it is wrong and they knowing it, and their dreams can be pretty lucid and real too because they have been suppressing themselves too much during the day.
In general however, dreams are usually just an expression of the subconscious mind. It is just another way of how the mind deals with extra energy and emotions. It does not represent anything much unless of course the dream gave a vision of the Dharma center that you need to go to and all the directions to there. At our level, it is very impossible for dreams to actually benefit us.