To be honest, when I first read the box (when my son was a newborn), I thought to myself, why would I ever keep my baby in one diaper for 12 hours (ewwwwww!) but the second he began sleeping through the night, I figured it out (hah!).These diapers are great and we have never had a morning blow outs, despite our son sleeping 12+ hours a night and definitely releasing a lot of substance into the diaper during that time. Moreover, he tends to roll several times at night and gets up and plays actively in his crib for a while (before we realize he is up) and even so, with all the movement, bouncing and a full diaper, there haven't been any leaks.We've put him in other diapers overnight and he's blown through all of those.