The prevalence of shiftwork, a system in which people work in shifts, has increased considerably over the past fifty years in most industrialized countries, and is currently rapidly increasing in the developing countries. ... All in all, however, there is a need for further reasearch before proposing the most effective ways for individuals to cope with their shifts systems.
――慶応義塾大学 総合政策学部(2月19日実施)――2005年