What about warmth?...I haven't tried this yet, but it sounds clever. After you establish your fire, gather rocks. Put the rocks in the fire to heat up. Dig a small ditch about 4-8 inches deep (enough to cover said rocks) and as long as you are. Put the rocks in after they are HOT. Cover with earth from the digging, and set your sleeping bag over the trench. The earth will insulate the rocks and keep the heat in. No sleeping bag?, gather leaves and test temp. so you don't burn your ass
