From a dream point of view, a vampire represents aggression and ferocity. To dream that you are a vampire signifies that you are sucking in the life energy of others for your own selfish benefit. Alternatively, it could also represent someone who is addicted to drugs or someone who is in an obsessive relationship. In short, that you are doing something in your waking hours that is draining your own energy. Seeing aliens in your dream signifies that you are having difficulties adjusting to a new situation or person. From the violent nature of the aliens in your dream, one can judge the nature of the new situation or person in your life.
Here?s my conclusion and yes, I can be a 100 per cent wrong. If so, please ignore me.
There is something or someone new in your life that you?re not totally comfortable with. Despite knowing that this person or situation may be wrong for you and your loved ones, you still associate with it, because it fulfills a certain need on either an emotional or physical level. The subconcious knowledge of this is either draining you or your subconcious mind is trying to tell you that this association is not good for you or those who are around you.