A great tip I picked up from the old man for staying warm at night without building an "all night fire" is this... several hours before bed, put a grapefruit sized rock in the fire, about an hour before bed shove that rock into an old pillowcase and throw it in your fart sack.
Leave it in while you sleep if its very cold out, or take it out before bed if you just want to warm things up in cool weather... but be careful about the rock you choose, if its been soaked in water it might explode in your face while sitting in the fire.
The water heats up and steam pressure can explode the rock.
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