Cold Overnight in a Snow Trench Shelter

This was my first time ever attempting this type of shelter. Minimal bedding, no heat source, and temperatures in the mid-teens - how fun is that?! I could have used my candle lantern for a little warmth, or gathered some wood and built a fire, but this was a good test of a snow shelter, my bedding, and my ability to endure cold.
As I was breaking camp at about 6:00 I saw the thermometer reading 14 degrees. By that point I had snacked, had a couple cups of coffee, and moved around a fair amount though, so I was feeling much warmer.
While I'm sure I could have done a better job constructing the shelter, I'm pleased with my first effort. It would definitely not be my first choice for an overnight shelter, but in a survival scenario in deep snow and in an area with limited trees it could be a life-saver.