You were right, it was the same clothes I had on all day. They probably were damp.
As for the sleeping bag, it does have a drawstring hood and collar which I cinched down tight. However it has little to no filling. It was a $20 bag from either Majar Surplus and Survival or Cheaper than Dirt.
I wasn't sure if the air mattress would help or not (sure is comfortable, though). I figured it would get me off the heat-sucking ground which is good, but since it's just several big air chambers the insulative effect seemed to be nil.
This is good stuff. Keep the info coming!
-Blast, who really should try to get some work done today.