Instruct: Classify a review as either positive or negative.
Query: Best sleep book available

After many recommendations, I bought this book and found it to be very helpful. At five and a half months, my son is going down to sleep for the night at 6pm and sleeping until 5:30/ 6:00 am. We're still working on naps, but I've found that when I stick to the advice, things work well. What's particularly useful about this book is that it is broken down by age so you understand how much sleep your baby should have at each stage and what is going on with them. I've read many others, but this is the best and most practical of them all.