Shift Work

http://en.wikipedia.org/wiki/Shift_work
http://www.cbc.ca/news/health/night-shift-effects-on-brain-comparable-to-chronic-jet-lag-1.2822334
http://sleepfoundation.org/sleep-topics/shift-work-and-sleep
http://humanresources.about.com/od/glossarys/g/shift_work.htm
http://globalnews.ca/news/1652629/does-shift-work-hurt-your-brain-memory-processing-affected-study/
http://www.sleepeducation.com/sleep-disorders/shift-work/overview
http://time.com/3556130/night-shift-brain-work-health/