Dreaming of a vampire could be symbolic of being totally sold out to the devil. It is symbolic of a resurrection of something from the past that sucks the life out of you. It could also symbolize a principality that seeks to take the life out of you and is the spirit behind chronic fatigue syndrome.
Positive: Dreaming of a vampire could be a warning from God, showing the dreamer a possible future if they do not repent. God could be giving one a way to escape a dangerous situation.
Negative: This could also represent one that has been turned over to the enemy. It signifies that a person has aligned themselves with the enemy and their spiritual life is being drained from them.
(Jeremiah 46:10; 2 Samuel 14:21; Leviticus 17:11; Ephesians 1:21; Ephesians 6:12).