Night Slaves

Night Slaves is a 1970 American television science fictionhorror film directed by Ted Post. Based on a novel by science fiction writer Jerry Sohl best known for writing episodes of The Outer Limits, Star Trek, Alfred Hitchcock Presents and as ghostwriter for Charles Beaumont on three episodes of The Twilight Zone, Night Slaves aired as part of the Movie of the Week series of TV movies produced for the ABC other TV movies as part of this series was Duel, The Night Stalker, Killdozerand starred film and TV actor James Franciscus and Lee Grant.

Clay and Marjorie, an estranged married couple, take a vacation together while Clay recuperates from a serious auto accident. They end up in a sleepy little town which seems to be normal, except at night when the townspeople and Marjorie turn into zombies, file into trucks and head out of town. They always return by morning, and no one has any memories of the night before. Only Clay is unaffected due to the presence of a metal plate in his head, and no one believes his story.

Source: Wikipedia