Before I Go to Sleep film is a provocative thriller that was conducted after a best-selling book that belongs writer SJ Watson. The film, like the book, tells the story of a woman passing by very heavy moments caused by a car accident, Christine (Nicole Kidman). She wakes up every morning and does not recognize anything of what is happening around them or people that surround it. This happens because of an accident that took place ten years ago and which affected so much brain as memory and resets every time he falls asleep. One day, terrible truths start to surface and do to doubt everything, including doctor (Mark Strong) and her husband (Colin Firth).