Before I Go to Sleep - Final Trailer

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Ten years earlier, Christine Lucas (Nicole Kidman) was beaten nearly to death in a hotel room. She has no memory of the incident, but since then, she wakes up every day with no memory of the day before. Her husband Ben (Colin Firth) posts photographs on the bathroom mirror to help her understand who she is each day when she wakes up.

Christine is contacted each morning by Dr. Nash (Mark Strong), a therapist who is trying to help her regain some of her memories, including the fateful night she was nearly killed so they can identify the man who attacked her. He encourages her to keep a video diary so she can review it each day and remember things so she doesn't have to start fresh from the beginning every day.

As memories return to her, Christine realizes she has a son and when Ben denies this, as well as other memories, she begins to question whether he's trying to keep her from remembering her past. He denies more of her memories, which lead her to wonder why. She starts to suspect Ben of not being who he says he is.

Based on the bestselling novel by S.J. Watson.