Does anything happen in a sleeping infant's brain? Researchers say yes: a Swedish team has discovered five networks of spontaneous activity in the brains of 12 preterm infants who each (miraculously) napped through a 10-minute fMRI scan. Such networks may help babies respond to stimuli even while dozing, the group says in their report, published online by Proceedings of the National Academy of Sciences USA—just in case parents were curious which part of their newborn's brain is keeping them up all night.