Just curious did you last all night? If not how long?I did it in 1971 in California during winter, 50 degrees, massive fog rolled in, I was in a hammock with a space blanket. It was an Xmas gift from my Dad to go with my survival gear. I was 8 and I wanted to do it. My Dad said go for it but use it as a reflector over you, not a tight wrap.
Did I listen? No. Of course he knew I wouldn't, great, long lasting lesson.