According to AstroSwami the meaning of your Dream is:
Dreams of vampires often stem from fears and feelings of inadequacy. They are often related to an unhealthy relationship in your life. This relationship can be with a boss, a parent or a boy/girl friend. Is someone "sucking the life" out of you? Do you feel overwhelmed at a power greater than you? Is this power taking everything out of you? Furthermore, the "vampire" can be your job, your school work or other duties that are taking everything out of you.