Thanks Jan. I knew there was no association between sleep apnea and myotonia - I was thinking more in terms of the muscle pain and discomfort that goes along with lack of quality sleep, which I suspect is increased by the myotonia. Anyone noticed a relationship between extreme fatigue and myotonia symptoms?
You might want to read this article...it refers more to muscle pain like fibromyalgia, but talks about how lack of sleep from apnea can exacerbate symptoms.
I think it's very possible to have both. One of the causes of fibromyalgia is repetitive injuries. When you consider that with myotonia we injure our own muscles on a daily basis all our lives, it's no surprise that we could develop the symptoms.
It seems to be a decreased tolerance for pain - the brain interprets pain signals at a much higher intensity. There seems to be no actual muscle inflammation or disease process, and it doesn't cause any damage to joints. But it can be incredibly painful and debilitating, and poor sleep is almost always associated with FM.
Usually fibromyalgia is diagnosed by rheumatologists. For years they thought it was psychosomatic but recent research has shown it is a very real condition that does respond to medications that target nerves.
One of my daughters has both MC and fibromyalgia and is in a wheelchair much of the time. I have no fibromyalgia even though I have the same genetic mutation and degree of myotonia. Many other factors seem to influence the onset.