I guess I'm opposite of most people: with rare exception I refuse to sleep outside if the overnight temperatures are above 60° F (my hiking partner and I refuse to sleep outside in July or August). So i generally carry a set of clean thermals to wear at night. Very light weight above 50° and thicker as the temperature drops. Below 40° I'll add a light hat. Below freezing I'll add socks. Once down around 10° I may add a mask.
My coldest nights, at -15° and -12° F I wore expedition weight thermals, one pair of wool socks, a down hat, a face mask, and light gloves. I stacked my 0° and 40° quilts. And I absolutely roasted. I woke up around 1 AM dripping in sweat. I stood up and turned on my headlamp and I was absolutely steaming.
In the rare event I find myself outside in Summer, it's never more than boxers and a t-shirt. In Africa and in Arches National Park in Summer, well, sometimes you have to just suffer through 90° nights completely natural.
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