You morons do not need heat at night, doesnt matter if its a blizard outside.
You are the heat.
Put on some pajamas and the sleeping hat (similar to santa hat, can be seen in old cartoons) and make sure you drank fluids, be it water, juice or tea, whatever, just have it inside you, you will not peee it out or need to peee at night.
Cover yourself with one turkish blanket first (blanket is basically a large towel and is super comfy) then the heavy winter cover, with feathers stuffing and plastic like exterior.
Tuck yourself in good, no gaps, no legs or arms sticking out.
Find your comfy sleep position and wait.
You will notice your own vody warmth spreading and being bounced back to you.
You will not feel hot, because of fluids, but if you wake up in the middle of the night, thursty or whatever, get out of bed, drink water and remind yourself first hand how cold it is but how war and comfy it is in bed, so you womt have trouble sleeing except you may dream of being crushed slowely or not able to run if you arent used ro heavy covers
Also, matrace must have a sheet of plasticy cover or memory sponge thing.
Combo of the 2 is genious