Late Fall boondocking?

Each must draw the line on comfort. We're in the low power use camp and keep putting more clothes on during those long cold evenings in the TC., and use a battery operated lamp on the table when playing games. Jeanie likes the cool version of sleeping and we also get the best night's sleep ever in the box. We've always used a couple comforters with regular bedding/sheets etc., one lightweight for Fall/Spring and a heavyweight for Winter. Every time we tried the sleeping bag bit, it was a disaster. I also tried using two mattresses for a time, but it cut the already low head room down too much. It did make a difference in ambient temps in the box. I'm thinking the OP will just have to try his luck with the school of hard knocks as there as many paths to follow as there are boondockers.
Good luck and please do report back with your findings.
regards, as always, jefe