InsomniatellsthestoryofsuccessfulcareerwomanEmmaAverill,whofearssheislosinghermindaftersufferingfromsleepdeprivationtwoweeksbeforeturning40bbb
Hermotherhadasimilarexperienceatthesameage,sufferingaviolentpsychoticbreakdownonthenightofher40thbirthday.Butevenassherelivestheexperienceofhermother,Averillbelievesotherforcesmaybeatwork.
Hermotherishospitalizedwithasuddeninjury,herestrangedsisterreturnswithoutwarning,andshefeelsasifsheisbeingwatched.Onlybyinvestigatingthetruthofherpainfulpast,canshefindtheanswerstoherpresent.