My almost 13 month old is crazy in her crib at night. She rolls backwards, forwards, sidways, sleeps on her stomach, sleeps on her back, sleeps with one leg sticking out, etc. Her lovey is the A&A blankets that she loves to sleep with it. But there is no way that thing will keep her warm as the weather is getting cool and its usually under her when she starts rolling everywhere.

Saw these in the store http://www.amazon.com/Walker-SleepSack-Lightweight-Wearable-Blanket/dp/B008VWQV5M/ref=sr_1_8?s=baby-products&ie=UTF8&qid=1382214173&sr=1-8&keywords=sleep+sack+for+toddlers#productDetails
and was wondering has anyone used this? I'm thinking traditional sleep sacks wont work bc she'll trip and fall and this seems like a good solution.

reviews?