Sometimes, when you’re going through a rough patch with your baby’s sleep, it helps just to know that it’s normal. A recent study published in Monographs of the Society for Research in Child Development helps in this regard, because it shows that when babies learn to crawl, they have a harder time sleeping during the night (1).

The study, conducted in Israel, followed 28 infants from about 5 months to 11 months of age. Every 2-3 weeks, the babies’ motor skills and sleep patterns were assessed...