God, I recall when we lost power for a week in the middle of a freeze, it was so cold that my multiple blankets weren’t enough to keep me warm when trying to sleep. I had to break out a nasty comforter that I’ve got that doesn’t breathe at all and gets real sweaty during normal weather. Worked well to lock in the heat.

It hit -8 C last week where I am, still a pleasant 20 C inside without having turned the heat on.

I probably get a lot of free heat from my neighbours apartments though, I would guess.

As long as it’s bearable with additional layers on, I’m going to lean towards doing that, as cool bedrooms make for amazing sleep quality.