Editing Shift work (section)

===Industrial disasters===
Fatigue due to shift work has contributed to several industrial disasters, including the [[Three Mile Island accident]], the [[Space Shuttle Challenger disaster]] and the [[Chernobyl disaster]].<ref name=":1" />  The Alaska Oil Spill Commission's final report on the [[Exxon Valdez oil spill|''Exxon Valdez'' oil spill]] disaster found that it was "conceivable" that excessive work hours contributed to crew fatigue, which in turn contributed to the vessel's [[Ship grounding|running aground]].<ref>[http://docs.lib.noaa.gov/noaa_documents/NOAA_related_docs/oil_spills/spill_wreck_ExxonValdez_1990.pdf Final Report: Spill—The Wreck of the ''Exxon Valdez'': Implications for Safe Transportation of Oil], Alaska Oil Spill Commission (February 1990).</ref>