Thanks for the concern. Not my first time building shelters. First attempt at sleeping overnight in one with out my bag and bivy. I will be with guys who are trained in this and that have medical training.

I may end up not sleeping much and doing a lot of burpees but thats ok. We will have a central fire going.

I am in the Midwest US. 6 inches snow low of 10 deg.

Sitting in that tree stand for 12 hours waiting for the perfect deer kind of gets me prepared for dealing with the cold.