This book was purchased because both my husband and I were exhausted from our baby's night crying. After reading the book and trying various things, it actually got better, so I recommend it to those who are struggling with night crying. Hints for Sleep Training That Even Self-Taught Moms Won't Fail by Kanae Kuronku A Manga Guide to Understanding Napping Training from 0 Years Old: A Gentle Sleep Guide for Babies and Moms