Well yea if you compare a space blanket or thermos blanket to a sleeping bag the sleeping bag will be more comfortable. The sleeping bag may be warmer in that it is closed at your feet and doesn't allow a draft. I would not recommend a space blanket as your primary sleeping arrangements for a winter tour. In the summer I think a space blanket will do though. I slept in mine last night and was getting plenty hot. I'm sure when it's 80-90 degrees and then with humidity the space blanket will be more than enough.

But I still think the functionability of a heavy duty space blanket is enough for touring. I'm not sure if I'll take up my suggestion of only using a water bottle to spray yourself clean after you get the job done. :0