hyperarousal

noun

1. (uncountable, usually)A state of heightened psychological and physiological tension resulting in reduced pain tolerance, anxiety, excessive response to sensory stimulation, insomnia, and fatigue.

   “Hyperarousal after a traumatic experience is normal. It occurs when a person's brain believes that person is at risk again because it misreads an external signal or trigger.”

   “A feeling of restlessness and an urge to move in your arms, legs or torso is a state of hyperarousal and can keep you from a good night’s sleep, she said.”