Vampire mythology has been with us for thousands of years and virtually every culture.  Let's take a look far into our past and consider this:

Early Sumerian mythology, dating back as far as 4,000 B.C., speaks of a vampire called the Ekimmu, or Edimmu, that would suck the life out of susceptible people including the young and sometimes sleeping victims. The Ekimmu were believed to be ghosts or spirits that were not welcomed into the underworld, usually do to an improper burial. The now vengeful spirit is forced to roam the earth and on occasion posses those that would not observe certain taboos. It was believed that this possession would cause disease and all around nasty behavior.

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