Hello I thought I could offer some Advice on sleeping in the cold
I learnt in the Field in the Antarctic to use a Thermal Blanket ( Fiol Ground sheet) inside the Floor of the tent. This stops the Perma Frost. I have used it for years of Winter Bushwalking in Tasmania. It helps with 'Cavity' beds. Actually makes all Tents a lot warmer! I use a Therma Rests, self inflating Matress. Have done for years. I hope that makes Camping a Bit Better for everyone. I come from a Bike Background & still travel light and compact. Get out there and enjoy it. But with a 'Tad' comfort. jim. :).