I was a little hesitant to spend $40 on this product but my baby would not sleep in his crib and I was desperate to try anything. The first time we used it for nap he cried for a few minutes and fell asleep, I had high hopes for this product. However, it did not improve the length of his naps or overnight sleeping. Some reviews claim their baby slept the whole night but that was not the case for us. Now I feel like it doesnt work anymore and I mostly put it on him to keep him warm.