I always thought vampires were the stuff of legend, but after doing a little digging through the scientific literature, now I'm not so sure. If you yourself have never heard of Renfield's Syndrome, don't worry. You're not alone.
Watch the video above or click below to read all about clinical vampirism. And don't forget to leave your thoughts in the comment section at the bottom of the page. Don't be afraid, talk nerdy to me!
Also on HuffPost:
The Morning Email helps you start your workday with everything you need to know: breaking news, entertainment and a dash of fun. Learn more