With this colder weather coming on I pulled out my silk long johns and recalled how much silk helps with my perspiration during the night even in the winter.
Here's a article about
it:
http://www.ehow.com/facts_5563225_undergarments-can-used-profuse-perspiration.html
Here's a link to where I purchased my silk long johns. They're very comfortable and warm and they come in different levels, depending on how warm you want them.
http://wintersilks.blair.com/thumbnail/Silk-Long-Underwear/Long-Underwear-for-Women/Womens-Warmth-Factor-2/pc/195/c/384/197.uts
They seem to be helping. I recall last year handwashing them now and then but I do seem to be sweating a lot less using them.