My four and a half year old son is very wriggly in his sleep and he often tosses off his blanket/duvet and then wakes up crying that he?s cold. (Somehow he?s still unable to find the blanket and pull it over himself again). What I found works best is a zip-up baby style sleeping bag i.e. the one with holes for the arms and a zip at the front. The problem though is the size. I managed to get a large one abroad which has served him very well for the last couple of years but now we need to move to a bigger one still. Except I cannot really find this type of sleeping bags for slightly older kids - they all tend to go up to 24 or max 36 months whilst the search for kids sleeping bags only brings the standard type i.e. the same as for adults, which seem too hot for indoor use. Does anybody know of a source for such a thing? Are they called differently? Thanks for any suggestions.