...now I have to run out and pic up a little candle lantern so I have heat.
I'm a mountaineer type. I love sleeping in snow, especially on full moon nights, as long as I've got my winter bag (Northface rated to -25 F)
I watched a fascinating program on PBS a few years ago about a science guy who trekked into northern Siberia looking for a nomadic reindeer herder. (He was a geneticist and had evidence that the herder was connected to the ancestors of his tribe that came up from India thousands of years earlier, but that's not the main story here.)
He hired a Russian half-track to carry him in as far as he could, then met a guide who walked him in the rest of the way.
He found the tribe of reindeer herders.
Now to the point of the story. They lived in double walled yurts. They put this scientist up for the night in a yurt (double walled) with a fairly wimpy sleeping bag. It had a single candle as a heat source.
Next day, he reported that he stayed warm all night. Insulation is the key.
Just imagine how heating bills would plummet if we got our act together with insulation.
We should live in igloos and double walled yurts in winter time. Cut those heating bills.