A taut thriller based on the worldwide best-selling novel by S.J. Watson, Before I Go To Sleep is the story of a woman (Nicole Kidman) who wakes up every day with no memory as the result of a traumatic accident in her past. One day, terrifying new truths begin to emerge that make her question everything she thinks she knows about her life—as well as everyone in it, including her doctor (Mark Strong) and even her husband (Colin Firth).