Then, when those defenses aren't used, you become anxious. Perhaps you aren't getting enough sleep, or the right kind of sleep. You may have insomnia, or a host of other sleep-related problems. People with FMS often have the alpha-delta sleep anomaly. Our body heals and many neurotransmitters are restored during delta sleep, so we soon suffer from the effects of sleep deprivation.
Neurotransmitters are electro-biochemical agents that cross nerve synapses.
They are the vehicles that carry information back and forth between your body and mind. Healthy people think nothing of picking up a glass of water and bringing it to their lips. They know just how tightly their hand has to grip, how heavy the glass of water feels, and how much speed is appropriate to accomplish this act smoothly. The thumb grasps with too little pressure, and the wrist muscle lets go when flexed. The economy of effort is not there.