A film adaptation of S. J. Watson's novel, titled "Before I Go to Sleep," was released in 2014, starring Nicole Kidman and Colin Firth. The movie closely follows the book's central mystery and psychological tension.
The narrative is entirely from Christine's perspective, and her amnesia means readers experience her confusion and discoveries alongside her, making her an inherently unreliable guide to the past. This narrative choice is central to the book's suspense.
"Before I Go to Sleep" is S. J. Watson's debut novel and established his style of psychological thrillers centered on characters with memory issues or altered perceptions of reality. His subsequent works continue to explore similar themes of identity and deception, often with a focus on the internal struggles of the protagonist.