Did it once with an emergency space blanket It turned a night that would have prob been no sleep with a possible side of hypothermia.

Into four good hours of sleep

I was young an inexperienced. But thank god I had the space blanket I was soaking wet when I came out of it, had to do jumping jacks by the fire while waiting for water for coffee?

Learned a lot on that trip. First thing was the few extra ounces of a heat sheet is worth it.