The Haunting (1963)

In "The Haunting," Dr. John Markway gathers three unique individuals to participate in a sleep disorder research project at the ominous Hill House. However, the guests quickly realize that Markway's fascination lies not in their sleep issues but in the malevolent presence that inhabits the mansion. As they delve deeper into the house's dark secrets, they come face to face with the chilling reality of its supernatural horrors.