Insônia (2016)

Leon is a reclusive cult-nerd journalist who works in a local newspaper in Rio. His life changes when he has a intense one night stand with the hottest girl of work. But the night gets really weird when she bites him on the neck at the climax of sex, leaving him right after and disappearing without a trace. After that crazy night, he starts to feel strange, craving for red beverages, having delusions and becoming sensitive to light. When women with bite marks on their necks start to appear dead in the streets, victims of new serial killer, he thinks he might be the one who's doing it and turning into a vampire. He then starts a investigation to find out if all this insanity is real or he is really loosing his mind.