Before I go asleep

I heard a lot of chatter about this book, but no one could really articulate why this book was on everyone's "to read" list. Having finished it, I understand why people like it but don't give a lot of detail. You don't want to give anything away. Half the fun of this story is piecing it together and makes the reader more empathetic to the main character. A light, enjoyable read, alas, also easily forgettable.

Added note: This book cover isn't nearly as appealing as the trade paperback edition.

Summary: The main character, Christine, suffers from amnesia from a mysterious accident. She awakens every morning with the loss of her memories. The man beside her in bed each morning is a stranger to her. She keeps a journal in order to jog her memory every day and through the journal, revelations begin to develop for both Christine and the reader.