Pee bottle. You don't want to leave/open the tent at night.
Boil water and put it in small Nalgene bottle at feet, in your sleeping bag. The warmth from that will help you sleep (at list it does me, it's very comforting) and legit keeps your feet warm for hours.
I put my boot liners at my feet in my sleeping bag. If I'm sleeping in a liner then I keep them in between my liner and bag. That way it's less moisture by my feet. Sometimes I do wear them to sleep.
Don't short yourself on socks to save on weight. Underwear comes second to that. And crusty shirts/leggings are whatever. Dry and comfortable feet help me so much mentally and who wants blisters when you're packing camping gear on skis?
I have a campsite pair that keeps pretty dry and rotate 2 touring pairs.
If you can spare the weight, I love my little lantern: https://www.rei.com/product/137939/goal-zero-crush-light-lantern
You just attach it to your tent ceiling (most tents can) and use that at night. It's nice to have something to quickly turn on and off that lights up the whole tent. I always fumble around to find my headlamp and it's not as easy to find stuff in the tent with that kind of light. So the lighting from this lantern is just far better, makes it feel more cozy too since it has different settings. It collapses flat, so easy to pack. Best of all, leave it outside at the campsite on on your pack during the day and it'll charge up enough for the night. I've had mine last no problem on 3-day trips. And it's easy to charge quickly with a power bank.