[ngpio]

> Speech patterns would adjust.

It isn't even hypothetical. The speech patterns of all English speakers who spend a significant amount of midnights awake have adjusted precisely like that.

There was a lovely looped animation of the world's online activity over the course of 24 hours. Can't find it right now, but I'm pretty sure it was on HN. It really exemplified how daytime no longer relates so much to the presence of the sun in the sky as it does to the level of physical alertness and electronic communication. High noon is more like the median longitude of human and network I/O than it is solar noon.