Sleep is crucial to a baby's developing temperament. Come to think of it, sleep is crucial to anyone's temperament. Every evening around 6, my three-month old would stare at me with sleepy yet alert eyes, willing me to do something. I had no idea what. But I knew that the fussiness would start in 15 minutes and go on for two hours until she wore herself out after an evening of crying and making me cry. One evening, the proverbial straw had broken my literal (upper) back. Supine, I googled infant sleep and got pages and pages of self-proclaimed experts unable to reach a consensus about how often infants need to be asleep. Some comments on these websites led me to bunch of books, all of which I bought. Of them, I found the following three books to the most helpful. Healthy Sleep Habits, Happy Child, by Dr. Marc Weissbluth ( ₹454.50 ) . Solve Your Child's Sleep Problems, by Dr. Richard Ferber ( ₹773) ; and The No-Cry Nap Solution, by Elizabeth Pantley ( ₹475 ).