Ever wondered where the word nightmare comes from? In Slavic mythology night mares are spirits, demons, goblins or souls that sit on a sleeping person's chest. That causes... well, as the name suggests, nightmares, but also they were the superstitious cause of death in sleep or cases of conscious paralysis (That is your mind is almost awake but the body is still not, giving the effect of paralysis in a dream).

I want this character in my novel, a daughter of http://galejro.deviantart.com/art/Ienitavereth-443964547 and a nearly human-looking vampire with a childish passion for choking people in their sleep, exploiting the myth of night mares.