Assumption: -there is no serious astronomical phenomena determining that - either the planet is tidally locked, has too long day cycle, or is too far away from its star and inside bases anyway humans rely on artificial light; -there is a colony of a size of at least medium city; -post scarcity economy is still far away. Sure, no one would mind artificial day-night cycle. However, wouldn't it be wasteful? I mean office / shop /classrooms tend to be closed for night. Using 3 (or at least 2) shifts would at least seem a more effective alternative. The first impression was that no one would be unhappy about it, after all I would mind being sent nowadays for night shift. However, I would not care if the "night" was 100% arbitrary. Nevertheless I started to wonder how would in such case family life look like. If each part of the family was permanently on a different shift? How would you think that organizing life would be the most effective? Arbitrary day and night? Citizen divided in to 3 shifts? (2?) Or maybe 6 shifts to avoid existence of rush hours? Suffering jet lag each time after changing school / job does not seem excessive. However, suffering jet lag to be able to attend an event (let's say - a staff meeting) - starts being inconvenient. Ideas?