I have to say that after keeping up with all of the comments, I’m going to change my sleep setup and system.
For no good reason really, I’ve been lugging a big 15 degree bag all over Timbuktu almost regardless of conditions. It could be lows in the 40’s and I’ll still bring my dumb 15 degree bag. Starting in the boy scouts with the “no clothes in the sleeping bag” and was perpetuated at least a little bit in the military. I always have just carried “too much” sleeping bag, and slept in my underwear 99% of the time because if I didn’t I’d be much too hot. Many nights I’ve slept with lows in the 40’s and 50’s with one leg out of the damn thing. It isn’t really comfortable to sleep in until the 30’s, and that’s in boxers.
I realize now that for most of my escapades I could have had a much smaller and lighter and more packable 35 degree bag and… just sleep in base layers and wear socks. And if it’s really cold, add a liner.
Kind of rambling here, but after seeing what a lot of other folks are doing, I’m definitely going to change my setup for the better. I love threads like this.