I feel the cold baaad now and work around it as best I can, this is what I do, for what it's worth
1/ sleep naked ( yeah I know , it's not a pretty sight with me ) thick cold clothing just keeps you cold.
2/ put as much insulation under you as on top, and keep it light weight and fluffy. ( we have a king size very fluffy cheap doona from Target) king size means no lifted edges for the cold to sneak in.
3/ Polar fleece from Spotlight is cheap, a piece about 700mm longer than your sleeping bags works well. At this length it will cover your feet and you can still pull it up over your head, and believe me , your body will work like a ducted heating system when you do that. (no you won't suffocate )
4/ Install a diesel heater, cheap as chips from "Aliexpress"
5/ For non drinkers the good old fashioned hot cocoa or milo just before bed
6/ For drinkers a good shot of scotch or green ginger wine works for me just before getting into bed
7/ while you're sitting around the fire, drape the doubled over polar fleece over your shoulders and back, works wonders
8/ A pair of ski gloves keeps your hands warm while holding cold anything and they're cheap
These things work for me and swmbo, and swmbo isn't mad keen on camping