Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book will really promise you sleep - so boring, useless

I bought this book simply by other readers' good reviews, and I felt disgusted, cheated, and angry after I read 3/4 of the book, and then I threw this book out. This book is so packed with dumb, useless information that there is nothing you can learn. Before you get anything, you will fall asleep. I am not sure whether I should ask for a refund, since it really kept the promise of sleep. THIS BOOK MADE ME SLEEP ! (even though I was eager to learn something about "sleep", and I was not sleepy at all). I don't know other reviewers, what kind of people are they ? How come they can give this book five stars ?