Static electricity?
Cold weather is more dry as by definition low temperature means low mean thermal motion of molecules. So water molecules escape less as they have less mean velocity. This means drier air.
Dryer air is a bad conductor of electricity . So high voltage can build up by friction etc.
Static electricity means that dawn loft have the same polarity of electric charge. So they repel each itself and each other.
Repulsion creates expansion.
Your dawn jacket or sleeping bag expands and traps more air which is a good insulator of not only electricity but heat too for the same reason. Great makers of such is Marmot, Vaude etc.
So you stay warm.
Nature and all the animals that use such techniques know.
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