I have not had the greatest luck using a MLD superlight bivy in various scenarios. I know condensation is an issue with bivies, but as a non-waterproof model I had hoped it would breathe well enough. But I used it this past weekend and when I awoke in the wee hours of the morning to heed nature's call, I unzipped and pulled back the top to discover a lot of moisture. It was pretty cold (15 degrees) so i expected moisture to condense, but I thought it would happen after the vapor passed through the top material. That is kind of the point of why I was using it (that and the fact I was in a floorless shelter). Do I need more heat (say, hot water bottles) to drive the vapor fully out? Or maybe something to catch my breath so that moisture doesn't contribute to the problem? Something else? I'd really like to make this piece of gear work, so any tips or advice is welcome.