Fibromyalgia is a syndrome of wide spread pain that is known from all parts of the world. An aspect of the syndrome of fibromyalgia is fluctuation as in onset of pain, variation in the level of symptoms, time off from pain and recovery from pain and other symptoms. The analysis of these fluctuations might create a basis for solid suggestions regarding the nature of the syn-drome itself. E.g. the pain level is well known to vary with mental and physical load including exposure to cold. Simultaneously, fibromyalgia has been found to mean an altered balance in the autonomic nervous system. In...