The reasons for that shift were not infinitely mysterious.
Some details of Iran's shift were reported in The Financial Times on Thursday.
Workers who rack up more sales per shift were often assigned more days.
Scattered around the stifling, dim wang ba, 10 power levelers just off the day shift were merrily gaming away.
That means the vehicle could, for example, move forward if the stick shift were positioned in reverse gear.
The seeds of this shift were planted in the early 1980's, when technologically adept students started taking computers to campus.
Streets that had been full of life long into the small hours, with men coming and going amid changes of shift, were silent and dark.
A team of 28 cleaners on an early-morning shift were replaced by half a dozen staff working in the day.
I drove through the development zone, where the factories, open for the night shift, were illuminated from within, like paper lanterns.
The seeds of Second Shift were planted when Ms. Weissmann was a first-time mother on maternity leave, living in New York City.
Hand-overs from doctors to nurses working the night shift were "formalised", a nurse was given a night coordinator role, and inappropriate bleeping of doctors was reduced.
