Nocturna: Granddaughter of Dracula is a 1979 disco/comedy/vampire film, scattered throughout with the occasional nude bathing and sex scenes, very much a product of its time. I laughed all the way though this one. It was John Carradine's last time to play the Count, who has been forced to turn his castle into a hotel to pay the taxes. Yvonne De Carlo plays Dracula's old lover Jugulia Vein.
Time Out concludes with this: "It's all terrible, but there's no indication that it's meant to be anything else. Only see it when you feel very, very silly."