Instruct: Classify Amazon reviews into positive or negative sentiment
Query: There's only one message here.

I rarely write reviews but I had to return to write this one. Despite this being a tome of 544 pages, there is only one message in this entire book, which is to let your baby "cry it out." Sounding like an old-school grouch, this author advises you to put your baby in his bed, shut the bedroom door, and avoid returning until morning. This behavior will miraculously (in just one or a few nights) result in a happy, well-rested baby. If this type of behavior toward your baby is acceptable to you, then this is the book to make you feel justified. In a few passages, the author pays half-hearted lip service to other sleep training methods, but the message is clear - none of those work as well as what he champions, which is to just leave your baby to cry it out or you're a weakling. This book was no help to me at all, and in fact, I wish the author would've kept his hands away from his writing device.