Early in Oct this year I was camping in the Pocono Mtns on a weekend trip with my Jeep club. Friday night temps went down into the low 40's and wind was blowing 25-40MPH. Even though I was in a tent I had forgotten to take my winter sleeping bags and only had lightweight summer ones with me. I had 2 extra blankets (1 under me and 1 over me and was still cold). Then I remembered that I had 2 space blankets in my BOB in the back of my Jeep.
I wrapped myself up in them then crawled into my sleeping bags and was fine for the rest of the night.
Might want to try this next time.