A lot of that gear you'd have to carry anyway if sleeping on the ground.
BTW, that was the motive for using the Precip jacket and pants as a VB. I carry them anyway during the Winter as a wind shell and for wet snow. Might as well wear them at night. They do breathe a little, I have no way of measuring exactly how much. All I know is my sleeping bag was much drier inside than my previous trip where I could feel the ice crystals beneath the bag shell, and I was warmer. They did feel a little clammy, but hey that's the whole idea, right?