<prompt> Pedzisa mutsara unotevera: Matambudziko okurara akapararira uye anogona kuva nemigumisiro yakakomba kuvanhu vanotapurwa pamwe chete nemigumisiro yezveupfumi nemimwe migumisiro munzanga. National Transportation Safety Board yeU.S., maererano naDr. Charles Czeisler, nhengo yeInstitute of Medicine uye Mutungamiriri weHarvard University Medical School Division of Sleep Medicine paBrigham neWomens Hospital, akawana kuti chikonzero chikuru 31 chetsaona dzemotokari dzinorema dzinouraya mutyairi chine chokuita nokuneta kunyange zvazvo zvisingawanzobatanidzwi zvakananga nezvinetso zvokurara, zvakadai sokurara usina kufema, nezvinodhaka nedoro sechikonzero chechipiri 29. Kushaikwa kwokurara kwave kuriwo chinhu chinokosha munjodzi dzinotyisa, dzakadai se  <response>: Kuputika kwemafuta paExxon Valdez, tsaona dzesayenzi yenyukireya paChernobyl neThree Mile Island uye kuputika kwechikepe chomuchadenga chinonzi Challenger. 