Thanks for the suggestion, FOG. The kids will be using sleeping bags. The adults....well, we have opted for our European down comforters with the coverlets which stuff in a sleeping bag sack quite nicely come to find out. We have been experimenting in our backyard (in the tent) with various combinations and the comforters seem to cover the gamut of hot nights to cool nights quite well. That is the temperatures here in Vienna have ranged from the 50's to the high 80's at night during our testing phase. And if we get too cold, the air mattresses snap together to make one double sized bed which allows my wife and I to figure out how to keep warm...

BB