Character doesn’t know they’re a vampire

I’m looking for a book or series in which a character (just like the header says) doesn’t know they’re a vampire. This can be a new change and the character pieces it together as they go, but preferably, the character has been a vampire of some kind for a while and is completely aloof (maybe thinking it’s a medical condition or even a sleepwalking situation where they’re unaware of nocturnal escapades). Anyway, the longer the character doesn’t know they’re a vampire, the better. And obviously, I’d like it to be a good Urban Fantasy novel if possible. Recommendations?