Michelle Miller is a chronic sleepwalker. She and her husband Dan Miller are trying to have their first child after she had a miscarriage the year before. One nightshe sleepwalks into the bedroom of her neighbor Luke Williams while his wife Nancy is out of town. They have sex; she is unaware of this but he not only knows aboutit but falls madly in love with Michelle and decides he wants to leave Nancy for her. Michelle gets pregnant| but doesn't know whether the baby is Dan's or Luke's.