if your out in the bush on a winter night and your area happens to have stones/rocks you can take a bunch of em and put them in the fire, then after about 2 hours take them out and burry them under about 6 in of sand/dirt in your shelter, they will keep it nice and toasty! Just make sure they arn't touching anything flamable. If your going to sleep on top of them you should wait for a few till the steam leaves from the sand. Oh an one more thing, if the rocks are wet i hear they can explode if you put them in the fire so you should probably avoid taking rocks from a river or something.
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