Spoiler warning: this post explains the full ending of Before I Go to Sleep. If you have not finished the book, stop here and come back later.
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Quick answer: Christine Lucas, who loses her memory every night, learns that the man claiming to be her husband Ben is really Mike, the man who attacked her years ago. Mike tries to kill her in a hotel room, but she is rescued, and she wakes in hospital to find her real husband Ben and her son Adam, whom she thought was dead.
Quick facts
– Book: Before I Go to Sleep by S.J. Watson
– First published: 2011
– Type: A psychological thriller
– Tone of the ending: Tense and hopeful
Table of Contents
What Leads Up to the Ending
Christine wakes every morning with no memory of the past twenty years. A man tells her he is her husband Ben. A doctor, Dr. Nash, secretly calls her and encourages her to keep a journal. In the journal, she finds the warning “Don't trust Ben.”
What Happens at the End of Before I Go to Sleep
Christine's journal leads her to her friend Claire, who reveals that Christine had an affair with a man named Mike, who attacked her and caused her amnesia. The man pretending to be Ben is Mike. Mike takes Christine to the hotel where she was attacked and tries to kill her. She is saved by Claire and the police. In the hospital, she meets her real husband and her son, Adam, who did not die as she was told. Her memory begins to return.
The Ending in 4 Quick Points
- “Ben” is actually Mike.
- Adam is alive.
- The hotel is the scene of both attacks.
- Christine's memory begins to heal.
What Happens to the Main Characters
| Character | What happens to them |
|---|---|
| Christine Lucas | Saved and reunited with her family |
| Mike | Arrested after trying to kill her |
| Ben | Her real husband |
| Adam | Her living son |
| Claire | Christine's loyal friend |
What the Ending Means
The ending shows the importance of memory to identity and the danger of trusting the wrong person.
Other Ways to Read the Ending
Some readers found the twist predictable, while others were shocked. The hopeful ending contrasts with the dark plot.
Themes the Ending Brings Together
Memory. Christine's identity depends on her journal.
Trust. She must decide who to believe.
Survival. Christine fights to save herself.
Is the Ending Happy or Sad?
Most readers describe the ending of Before I Go to Sleep as tense and hopeful. How you feel about it usually depends on what you hoped for the characters and what you expected S.J. Watson to do with the story, so it is worth asking friends how they felt before you compare notes.
Who Will Like This Ending
Readers who enjoy endings that are tense and hopeful will find a lot to talk about here. If you prefer every thread tied up neatly, it helps to know in advance how S.J. Watson closes the story, which is exactly why many readers look it up. Either way, the final chapters reward a second look once you know where everything is heading, because small details from the middle of the book start to matter. If you are reading with a group, agree beforehand whether everyone has finished, so nobody has the last chapters spoiled.
Book Versus Adaptation
The 2014 film with Nicole Kidman follows the main twist.
Discussion Questions About the Ending
If you are reading Before I Go to Sleep with a book club or a friend, these questions work well once everyone has finished:
- Did the ending surprise you, or had you seen it coming from the first chapters?
- What does the final scene say about memory, and do you agree with S.J. Watson's view?
- Which character made the most important choice in the last part of the book, and was it the right one?
- How would the story feel if it had ended one chapter earlier or one chapter later?
- Does the ending leave you hopeful about the characters, or do you worry about what comes next?
- Would you describe the ending as tense and hopeful, or would you choose a different word?
How to Read the Final Chapters Again
- Compare the opening with the close. Look at how the first chapter introduces memory and how the ending answers it.
- Track each final choice. The table above shows where every main character ends up, so ask which of those outcomes was earned.
- Notice what S.J. Watson leaves unsaid. Gaps in the last pages are often deliberate, and they are where most of the debate about the ending begins.
- Listen for echoes. Images, phrases or settings from earlier in Before I Go to Sleep often return in the final scene with a new meaning.
Questions to Ask Yourself After Finishing
- Was the ending of Before I Go to Sleep earned by what came before it, or did it feel sudden?
- Which character's final moment affected you most, and why?
- If you could change one thing about the last chapters, what would it be?
- Did the ending change how you think about the opening pages?
Check price of Before I Go to Sleep on Amazon
Books to Read After Before I Go to Sleep
- Gone Girl by Gillian Flynn
- The Girl on the Train by Paula Hawkins
Related: Before I Go to Sleep by S.J. Watson: Summary and Key Takeaways · Before I Go to Sleep Book Club Discussion Questions
Frequently Asked Questions
What happens at the end of Before I Go to Sleep?
Christine Lucas, who loses her memory every night, learns that the man claiming to be her husband Ben is really Mike, the man who attacked her years ago. Mike tries to kill her in a hotel room, but she is rescued, and she wakes in hospital to find her real husband Ben and her son Adam, whom she thought was dead.
Is the ending of Before I Go to Sleep happy or sad?
Most readers call it tense and hopeful.
What does the ending of Before I Go to Sleep mean?
The ending shows the importance of memory to identity and the danger of trusting the wrong person.
Is the ending of Before I Go to Sleep the same in the adaptation?
The 2014 film with Nicole Kidman follows the main twist.
Who wrote Before I Go to Sleep and when was it published?
Before I Go to Sleep was written by S.J. Watson and first published in 2011.
Is Before I Go to Sleep worth reading if I already know the ending?
Yes, especially if you enjoy psychological thrillers. Knowing the ending can make a first read richer, because you notice how S.J. Watson prepares for it from the opening chapters.
Should I read Before I Go to Sleep before reading the ending explained?
Yes, if you plan to read it, because this post gives away the whole ending.