overactiveness
/ˌəʊvərˈaktɪvnɪs/noun
The quality or condition of being overactive; (Medicine and Physiology ) abnormally active behaviour of a gland or other organ.
Origin
Mid 17th century; earliest use found in Jeremy Taylor (d. 1667), Church of Ireland bishop of Down and Connor and religious writer. From over- + activeness, in later use after overactive.