Originally Posted by dkottum
A vapor barrier on the warm side is a solution but who wants to sleep on a sheet of plastic.
Actually, you might want to. Get a Mylar "space blanket" and place it under the mattress. It will reflect your body heat back up to you, allowing you to sleep warmer, as well as serving as a vapor barrier to help control condensation. And since it's under the mattress, not over it, you won't feel
like you're sleeping on a piece of plastic.