Throughout recorded history and probably back beyond that, the idea of the psychic vampire has haunted mankindâs dreams. Strange mystical, mythical creatures who lurked in the darker recesses of the human mind, these beings were thought to sap the energy of living mortals, reducing them, unless stopped, to shadows of their former selves. People who, for no apparent reason, became continuously tired, listless and lethargic were often thought to have been visited by vampires or evil spirits.
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http://www.whitedragon.org.uk/articles/vampyres.htm
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http://www.whitedragon.org.uk/articles/vampyres.htm