After its introduction in 2009, the Fisher-Price Rock ‘n Play infant sleeper quickly became a cult favorite among sleep-deprived parents. News spread about the sleeper’s ability to get babies to sleep faster and longer due to its “nest-like” comfort, inclined resting position, and automatic rocking feature. But various studies determined that the Rock ‘n Play does not, in fact, “rock”—at least not when it comes to safe sleep for infants.