Watch The Sandman for Free: How to Stream the Movie Online at 123Movies. . THE SANDMAN tells the story of Nathan, a young student in the city who struggles to forget his childhood trauma at the hands of the serial killer dubbed "The Sandman." Nathan killed The Sandman years ago, on Christmas Eve, after he witnessed the murder of his mother... until he sees the beautiful woman who lives in the apartment across the way dying at the hands of that same masked killer. This brutal murder plunges Nathan into an odyssey into the night country of his past, his dreams... and the buried secrets of The Sandman.