I was skeptical at first. I purchased the 6-12 month sleep sack.. My baby is now 8 months old and has never been that bad of a sleeper but did start to wake up multiple times throughout the night randomly. I was so tired and saw an advertisement on Facebook and thought I'd give it a try. She sleeps throughout the entire night with this on every single time. We sing a little "nap sack" song when it's time to put it on and she gets so excited. I will forever sing praises for this product.