I was diagnosed with mild Raynaud's many years ago, but I don't think it is related. In the past, this symptom has waked me up. I go to the tub and run cold water over my feet. Then I come back to bed and rub hand lotion on my feet and hands. The evaporative cooling effect feels nice.
I think I know what I was doing to cause this (described in my 27 Oct 2011 post below). I've stopped it, and, so far so good. ******** UPDATE: THIS IS POSSIBLY RELATED TO MELATONIN - SEE MY POST BELOW OF 5 MAY 2013.