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There is an intersting article on heat loss whilst camping here;
http://www.backpackinglight.com/cgi-bin/backpackinglight/00184.html
It has this to say about reflective foils etc;
Minimizing Radiative Heat Loss
In windless conditions when the body is not active, however, it can be significant, especially at night. Radiative heat loss can be minimized by one of two methods. The first is by wearing a reflective barrier (such as aluminized nylon or mylar) near the skin capable of reflecting infrared radiation back to the body. The second is by wearing thick clothing (e.g., down or high-loft synthetic fill garments). The latter strategy is effective because infrared radiation cannot travel through thick insulation, and thus, most of the infrared radiation lost by the body can remain entrapped in the clothing system rather than exiting out to the environment.
The second bit in bold makes the point that radiated (IR) heat does not travel thru thick insulation, thus there is none to reflect by the time it travel thru your clothes, sleeping bag and sleeping mat.
------------- Stuart.
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