hyperexcitability

noun

hy·​per·​ex·​cit·​abil·​i·​ty ˌhī-pə-rik-ˌsīt-ə-ˈbil-ət-ē 

plural hyperexcitabilities

: the state or condition of being unusually or excessively excitable

a period of hyperexcitability of all or most of the reflexes

—S. W. Jacob