Hi Richard. A couple of other interesting articles would be (I may have them at home on another computer)
Henane R, Buguet A, Roussel B, and Bittel J. Variations in evaporation and body temperatures during sleep in man. J Appl Physiol 42: 50–55, 1977.
Newburgh L, Johnston M. The insensible loss of water. Physiological Reviews 1942; 22(1):1-18.
Average water losses per day are about 1200 ml urine, 200 ml stool, 900 ml insensible (600 ml skin; 300 ml breathing). Older texts put, IIRC, insensible at 600 ml for both skin and breathing. Insensible water loss is affected by environmental temperature and humidity, altitude, volume of air inspired, air currents, clothing, blood circulation through skin, and water content of the body.
Skin loss can be decreased by high humidity, but I don't think you can stop it. One research article said high humidity can lower by 40% the water loss in infant skin. Infant skin is more permeable to water movement than adult skin. If 600 ml moves through skin per day, maybe 300 ml or less moves at night if in winter tent for 12 hours. If it takes several hours to achieve high humidity to decrease skin insensible water loss, then an insignificant amount of water is "conserved".
My 2006 response to the Warmlite article is at