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The current study investigated the hypothesis that co-sleepers die more rapidly from causes such as suffocation from overlaying by comparing levels of reactive astrogliosis in the medulla of infants who died sleeping alone to those who died co-sleeping. The amount of glial fibrillary acidic protein (GFAP) staining in alone sleepers was significantly higher than shared sleepers in 3 specific areas of the medulla, the inferior vestibular nucleus, the medial vestibular nucleus and the cochlear nucleus. Given that glial fibrillary acidic protein elevations follow a delayed time course, this suggests that death in co-sleepers was more rapid, not allowing for reactive gliosis to occur. 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