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I've slept on the back of my truck at -10F, but I had three lawn chair cushions to keep me off the bed, and 2 full body blankets plus a head blanket.
Absolute coldest I've ever slept in was reported -22F with a cattle fan blowing on me, but that doesn't really count, because I was inside the house with a feather tick and about 15 layers all together. I still woke up at about 1am and remember thinking that I needed to close the window or I would die, and so I closed it, then went back to sleep. Woke up and discovered that my head blanket had come undone and my ear has never stopped ringing, although part of that is /k/ related I'm sure.
