But you'll lose consistency of everyday human communication. Phrases like 'I slept until 11am', or 'I obviously don't want to schedule a meeting before 8am' will become meaningless. And anyone who travels far away will have to relearn what time they want to wake up to stay in tune with the local sun day.

And then 2/3 of the world will not have a date change while asleep. That’s just bizarre for a triviality such as scheduling.