Brainstorm! One of Hammer Films' ventures into the psychological horror realm, Fear in the Night is more fun than frightening. Plot has Judy Geeson as a young woman recovering from a nervous breakdown who moves with her husband to a boys' school. Once there she appears to be once again terrorized by a man with an artificial arm, but nobody believes her. Peter Cushing, Ralph Bates and Joan Collins also star, in what has to be a candidate for weakest of the Hammer psychological series of films. Things are not helped by it coming off as a cheap knock off of Hammer's own superlative "Taste of…