insomniac

n person who finds it difficult to go to sleep 失眠者; 失眠症患者.

insinuation, insipid, insipidity, insipidly, insist, insist on sth. (doing sth.), insist upon, insistence, insistent, insistently, insofar, insofar as, insole, insolence, insolent, insolently, insoluble, insolvency, insolvent, insomnia, insomuch, insouciance, insouciant, Insp, inspect, inspection, inspector, inspector of taxes (also tax inspector), inspectorate, inspiration, inspirational, inspire, inspired, inspiring, Inst, instability, instable, install, install (US also instal), installation,