Our little one is 2 and has started putting up a fight going into his sleep sack so we have decided to take him out of it and use his duvet. We started with naps and it went great. We've been using it at night, he goes down fine but between 3am-5am he can stir because he's cold and kicked it off. Sometimes I've snuck in before and its stopped him waking but any ideas on how we can help or what you have done? Thank you.