Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Potent Soporific

This book's tongue-in-cheek title led me to expect an entertaining and informative history of one of the world's great foods. I discovered, rather, an informative but tediously boring history of the rural peasantry of Ireland, England and France in the 18th and 19th centuries. I can only recommend the book as a potent soporific capable of curing the most pernicious case of insomnia. If your sleep habits provide sufficient rest, don't bother.