I used to have the same problem until I switched to a hammock. For me, laying on a pad that doesn't breathe makes me sweat, then I get cold. Hammocks breath all the way around and with a good quilt on top and a good underquilt below I can stay warm with a breathable system. It took me awhile to dial in my hammock setup but it's helped eliminate the sweating. Your issues may be entirely different than what I was dealing with but it's something to think about.
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I have yet to figure out a good cold weather system, truck camping in the back of my grand cherokee I have tried sleeping in nothing and with base layers, I am either freezing because I am cold or cold due to sweating.
I have put my mummy bag inside my wifes rectangle bag so I know I have enough insulation with that set up but still freeze, My mummy is a north face cats meow which I know is not very well rated for winter camping but inside another bag I would think is enough insulation.
Going to try sleeping in synthetic sitka base layers and see how that goes this year. Also looking into a new bag and was going down until I heard that podcast.
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