Seriously,
If You Are Able To Cook, With Gas, Electricity Of Firewood:
Try Adding Stones Or Rocks.
If Stones, Or Rocks Reach Heat, You Can Place The Rocks Somewhere,
They Will Be There Overnight Warming The Area Somewhat.
I Was Just Told That "As A Tip/Hack/Shortcut".
-While Camping,
And One Is "Cooking/Boiling Food":
Add Rocks To A Fire.
Then, Those Rocks Will Keep Warmth For A Couple-Of-Hours.