Concerning dreaming, generally, the importance that we give to dreams is only if it shows some positive growth in our practice. To give an example is when a nightmare changes, what should have been a nightmare, but you are able to change your reaction in it and dispel the nightmare. I've had quite a few, one example for me was sitting in a room very similar to this, and seeing out the window that an airplane was shooting rockets coming straight towards the building. We were very soon going to be blown apart. I sat down and started meditating. Getting ready to die, I was able to change the reaction that for other people would have been that they wake up screaming. We feel those sorts of dreams are showing that the practice is going down deeper. It's becoming more of our personality that we are able to bring up something like that in a dream.
As to reflection, if you have a dream in which something was totally out of control, you wake up and so on, you can use it for reflection in any way that you normally use reflection meditation, just put it into one of the types of reflection practice, and the dream is just another type of imagined experience, so for that matter, any experience can be used for reflection.