I remember heavily frozen window panes. We'd heat up coins to unfreeze little places to see out of. Our bedrooms were all upstairs, which was woefully-underinsulated. We'd go to bed in thick flannel gowns and pj's with wool socks on our feet, under pounds of quilts and blankets. We'd stay warm, but WOOO! when you had to get out of bed in the morning.
I remember about the same thing in the winter, Jujube. I grew up in northern Idaho, and below zero was a normal winter for us.
My bedroom was in the very back of the house (which was an old house anyway), and the only heat we had in the whole house was an oil stove in the front room. My room had been the back porch at one time, and then closed in, and it did not have much insulation at all.
The windows would always be covered over with those beautiful whorls of frost and I couldn’t see outside. If I blew on the window for a while, it made a little circle so I could see out, at least until it froze back over again.
I slept in my warmest pants and a sweatshirt, and bundled down inside the sleeping bag and a quilt on top of that. It was pretty warm in there once I got over the freezing and shaking from getting ready for bed, but, like you said, getting back out of the bed the next morning was awful.
I would have my clothes laid out the night before, jump out of bed, grab the clothes and streak for the front room where the oil stove was doing its best to keep that old house warm, and get dressed as close to the stove as i could get without burning myself.
Just thinking about it makes me glad that I don’t live up there anymore !