Before I Go to Sleep is an British-American mystery drama thriller movie. It was written and directed by Rowan Joffé. It was released in the United Kingdom on 5 September 2014. It was later released in the United States on 31 October 2014. The movie was an adaptation of S. J. Watson's 2011 novel of the same name. The movie stars Nicole Kidman, Mark Strong, Colin Firth, and Anne-Marie Duff.