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Make sure to be warm when you crawl in the hammock. Hot drink (cocoa), camp chores, fast walking, a few jumping jacks right before snooze.
I pile snow around my tarp but keep it out enough that the...

For me .... a covered neck, head and wrists works wonders.
some nights though your just colder ..... just the body I reckon. Being tired, run down, hungry, dehydrated. I took cold medicine once...