Neat way to survive cold nights with very minimal gear

I've done this before but the coal bed method where you bury the coals. It does work pretty good if you get the right depth. I'll have to try this method next when I get the chance
I will be trying it also, if it keeps you warm and toasty in Alaska must pretty good for anywhere else in an emergency. The two space blankets can basically fit in your pocket so its nothing to carry really.
 
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You can also heat up rocks (nonporous) and place them near you while sleeping. Don't use porous rocks or rocks from streambeds or they might explode in yo face. But this can generally be avoided by warming the rocks next to the fire before tossing them directly in. You'll need nomex gloves or makeshift tongs to get the rocks out of the fire