Good morning.
The point on this post is not the nervous system I think. The vessels in your head area are very shallow and your sensory to your ears can hear an increase in blood flow or pressure. Now I would look at this as a vascular issue. Whether the neck muscles are tightened and when you lie down you are not draining the upper head area well. Raising the head may help..in fact putting blocks under the headboard legs can help with the drainage.
I have found adding pillows only crimped my neck more.
B/P being too high can give this symptome as well...so you should be checked and randomly if you can (wallmart...home cuff...walk in to PMD office and see if you are running high, and it is ot the muscle or our poor dragon we blame everything on!
Back to neuro.....the synapse or junction between the muscles has a chemical exchange going on and it is ni here...plus chemistry within the muscles with oxygen and sodium, potassium and calcium (electrolytes) that can create the muscle twitch and throb you sense...
Just to maybe be a bit clearer for you.....If I had it all the time i would look at my hydration, my chemistry...electrolytes...(gatorade) and the leg circulation (that maybe I need supprt socks or hose.....to helpmove the blood forward from the legs.
I wear supports all the time. I use a company called
www.walker.com they are the cheapes....plethora of styles , even to the lace topped ones i own that are thigh high.
But talk to the MD and share all the crazy symptoms you feel those who know this condition can filter the FM from the medical issues that can be creating the symptoms.
Good luck, Nancy B