more like backpacking through the mountains kind of tips along the lines of burying hot coals under you so you can sleep in heat
You are better off building a long fire that burns 4' logs and sleeping long ways next to it with a reflector behind you than trying to bury embers...
I saw that on a movie when I was young and I've tried it several times... I just can't get it to work for me.
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My favorite Camping 'Trick' is to take a piece of 1/2" plywood along with three holes drilled in a triangle pattern near the edges,
Large enough to work as a cutting board, table for food preparation, and easy to cover with aluminum foil for sanitation or a fire reflector/emergency mirror if needed.
The three holes are about 3/4" in diameter so with three sticks you can make table legs and keep it up off the ground.
That and an old outdoor grill or refrigerator shelf for a fire grate, you can turn about any camp fire into real food preparation, dining and even have a table for 'Cocktails' afterwards.
When I'm not hiking far, like when hunting, I take a 3/4" thick piece, so it can use it for a stool/chair when I'm hunting!
I've even used it under the jack to keep the jack from sinking when changing tires or repairing the jeep!
On the motorcycle, they grate and board go in the back of the saddle bags to keep other packed stuff from pushing the leather into the tire while going down the road.
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Finding a fire spot with two or three saplings on the other side is always a good thing...
I often spread the 'Emergency Blanket' between the saplings on the far side of the fire to reflect the heat/light into my tent or shelter.
If you are someplace there aren't a lot of saplings, or they aren't handy (like on a slope where camping is inconvenient) then just push some sticks in the ground and stretch foil between them to reflect the heat/light back towards you.
Remember, the foil or reflector needs to have an air gap under it, since fire rings usually block the light down low anyway, and it's more effective if it's up 6" to 1' from the ground when it starts.