Masters of Horror (2005)

S1E2 Dreams in the Witch House

Walter Gilman, a university student, moves into an attic apartment in Arkham, Massachusetts, as he delves into interdimensional string theory. However, he is plagued by terrifying dreams featuring a 17th-century witch and her rat with a human visage. As these eerie visions intensify, Walter finds himself racing against time to save his neighbor's infant from sinister forces that threaten its life, all while grappling with the chilling possibility that he might unwittingly become the killer himself.