“Temperament is the dividing line between children who sleep easily and well . . . and those who don't.” SleepTemperament Book:Why Won't You Sleep?!: A Game-Changing Approach for Exhausted Parents of Nonstop, Super Alert, Big Feeling Kids Source: Why Won't You Sleep?!: A Game-Changing Approach for Exhausted Parents of Nonstop, Super Alert, Big Feeling Kids