My dd is 15 months and happily sleeps in her Grobag sleeping bag. We've got the 2.5 tog one, and want to invest in the next size up because she is so long. But ideally we'd like a warmer sleeping bag and Grobag only do up to a 2.5 tog. Has anyone found warmer sleeping bags anywhere? The reason we need it is that her room is freezing cold in winter. We've done everything we can to warm it up, including loft insulation, but it still was going down to 11-12C during the night last winter.