Death Bed: The Bed That Eats (1977)

If you want to survive, don't go near THE BED.

At the edge of a grand estate, near a crumbling old mansion lies a strange stone building with just a single room. In the room there lies a bed. Born of demonic power, the bed seeks the flesh, blood and life essence of unwary travelers… Three pretty girls arrive on vacation, searching for a place to spend the night. Instead, they tumble into nightmares – and the cruel, insatiable hunger of the Bed!