Finally another person besides myself that experienced this after waking up...
No tarp? While not the specific cause, that probably didn't help. Some thoughts:
1. I think the UQ just creates such a warm and damp environment (insensible perspiration from you) which simply escapes the path of least resistance.
2. In general, the foot end is always going to be the trouble spot with "leaks" (based on 8 years of experience and hundreds of comments in this forum). Even if you have a perfect setup, the calf ridge area (accordion-type bunching of fabric under knees) sort of siphons the heat out. Even a UQ draft collar won't block all those tiny gaps.
3. With the foot end higher (agreed to be the "correct" way) I suppose the heat/moisture from your body will naturally move in that direction
4. Could it be as simple as down shifting with less on this side making the warm/cold margin narrower?
5. That 3° temp down to freezing is just a nasty area for causing this. If the dewpoint was approaching or hitting 3°, and no wind, it seems to be unavoidable.
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