It is worth noting that most of these studies—and, indeed, virtually all sleep books—recommend a “bedtime routine” as part of any sleep intervention. There isn’t much direct evidence on this—the review refers to it as a “common sense recommendation”—but it is generally included with all intervention approaches. The idea is to have some activities that signal to the baby that it is bedtime: putting on the baby’s pajamas, reading them a book, singing some kind of song, turning off the lights. Basically, no one recommends throwing a fully clothed baby in the crib with the lights on, telling them
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