Edimmu
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In Sumerian mythology the edimmu or ekimmu were a type of utukku. They are the ghosts of those who were not buried properly. They are vengeful toward the living. They could possess people if they did not take into account certain taboos, like not to eat ox meat. They caused disease and inspired criminal behavior in the living, but could sometimes be appeased by funeral repast.
It is also believed that Ekimmu were a form of psychic vampire. They were referred to as "evil wind guests" and 'wind' could have been used to mean 'breath' and thorough Occult studies we find that breath is directly related to the transfer of psychic energy.