Do vampires really exist?

We all know about the mythical creatures of lore and the tragic character of Dracula so beautifully created by Bram Stoker. We also know that our children ask the question of whether or not vampires exist. We probably, at some level ask ourselves that same question, because in essence, vampires drain life blood from their victims to the point that they do not die, but rather, become like them… walking the earth dead and and never satisfied; doing the same to others. Are their people who fit this description and is it only blood they seek? Or are their also emotional vampires, psychic vampires, etc that are real and fit the description of these mythical characters. Have you ever encountered one?