The Incubus and succubus (plural: incubi and succubi) are demons in the form of male and female humans (respectively) who lie upon sleepers in order to have sexual intercourse with them. They do this to produce incubus/succubus offspring. Repeated attacks by them apparently result in extreme fatigue, illness and eventually even death. But are these really supernatural attacks, or do they have a more 'down-to-earth' scientific cause?
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