And you’re definitely not mad, hammocking is great, low temperature just means you need more insulation.
I’ve just been trying to find a blog post by climber Andy Kirkpatrick. I’ll keep looking, but upshot is: make sure you’ve eaten a good meal before you go to bed, or at least don’t go to bed cold and hungry. eat some nuts before you go to sleep. “Light a fire” he says.
Story was him dirtbagging under the Eiger, eating as cheaply as possible, he had a couple of miserably cold nights and thought that was just part and parcel of the whole thing. Conditions changed and they couldn’t climb or something, ended up in town and treated themselves to a decent meal. Didn’t change anything he wore/slept in, but he was absolutely toasty that night.
Couldn’t find it, but this is a good read, some of it might be useful.
https://www.ukclimbing.com/articles/skills/10_tips_on_staying_warm_in_winter_by_andy_kirkpatrick-6903