Sexsomnia - Sex While Asleep

Sexsomnia is a real life disorder. [link to www.webmd.com]

whileits extremely rare.. less than 8% of the worlds population,, I strongly believe this condition is what gave rise to the Succubus, and BarBarduk Folklore.. I believe in the past people did not understand medical conditions as we do today and explained them away as demons or other dark creature..

Rabbies could have given rise to the warewolf tales..

well modern vampires came from the Mercy Brown story. [link to en.wikipedia.org (secure)] the attribution of this to vald the impaler is strongly misguided... I guess bramstoker thought would have made a great backtory i suppose..
In reality vampires came from distant past origins and are far different than the tales we hear today.. Ususlly when people died they would wedge a stone in theor mouth, stake in their chest to pin them to the ground, then cut their hearts out roast it and eat it.. You see in the past vampires were people that died, and came back in the night and sucked the souls of the relatives killing them.. What triggered with was the diseases.. TB was a prime one,, people did not understand how TB spread and entire households were wipped out.. They explained this as Vampires and believed they had to do those things to stop the attacks.. another possible diseases is PolyPhora which makes hema light sensitive.. read more here.

[link to thebrainbank.scienceblog.com]