Hi all, am a bit perplexed about what I should be doing to keep my 10 week old DD warm at night in this chilly weather. Temp gauge shows the nursery is dropping down sometimes as low as 10 degrees. Should we be keeping the heating on at night, or just adding layers of bedding? We have her in a 2.5 sleeping bag plus one sheet and a light cotton blanket folded in two. This feels like too much but it is also really cold! What are others doing?