The SwaddleMe® Night Sack Sleeper is a sack-style wearable blanket that keeps baby safe and cozy while eliminating the need for loose blankets in the crib. Baby sleep sacks are designed to be layered over pajamas, leaving baby’s arms free. The Night Sack Sleeper is perfect for little is perfect for little ones who have transitioned out of wrap and compression swaddles and don’t like to be swaddled tightly. The hip-healthy design leaves plenty of room to move, and a two-way zipper makes it possible to change a diaper without waking baby. At SwaddleMe, we know that being well-slept leads to a happier life for babies and parents.