i would suggest setting up a tent inside your home for a sleeping area, crumple up newspapers as insulation (fire hazard) , and pile in sleeping bags and blankets. disposable 10 hour hand warmers are $2 for six at walmart. you have to eat to fuel the furnace in your body, carbs/fats/sugars. wear a hat, big heat loss if you don't. i wear thermal underwear from now till april, wool socks, light gloves while driving or shopping.

water is also important in regulating body temps. this takes some training, but shivers start in your lower back, if you can focus on relaxing your lower back, you actually stay warmer. shivering helps kick the body into warming up, but can get out of control, wasting energy.

i winter camp and have slept on the ice bergs, i grew up in this crap and don't like it. but i do manage to stay warm ;)