Theatrical trailer for Before I Go to Sleep.
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).