Now just suppose that film is there to visually captivate the context of the raw synopsis of the story written in the book in its simplest form, because believe it or not accuracy isn't the key here its making sure you understand the point, and the plot is quite interesting if you stop to think about it - A violent amnesia thriller which is thrilling to watch but unmemorable.
Another man, Dr. Nasch, calls every day and asks Christine to locate a video diary she keeps and to watch the recordings. He then meets her for a series of appointments and tests. As Christine has flashes of memory and records them in her diary, she begins to discover that something isn't quite right in her strange little world. The script has its fair share of twists and plot holes to keep the audience gripped to the drama and interested to carry on watching, but in the book its more established in depth which sadly is absent in this film.
Before I go to sleep is an okay-ish type of film. Nothing truly spectacular or memorable about it at all which is a surprise given its interesting choice of cast, the average viewer may not likely not be going to remember this film any time soon, and yet it's still serviceable.
If I'm being honest and presenting this in a critical way I expected more drama, the acting really does help elevate the film's interesting premise from underwhelming to almost average standard. It's not the only thing that works, though: it's interesting while watching it and suitably tense enough.