Humans already don't plan their day strictly around sunlight. Otherwise we wouldn't go to bed at 10pm and get up at 6am (or even later) but rather go to bed at 8pm and get up at 4am.
> Humans already don't plan their day strictly around sunlight.
For maximum health & energy efficiency, though, we probably ought to (just like we probably ought to build our houses so that air conditioning is optional & heating is efficient).
I would argue they still plan according to the sun. Why have most westerner cultures slowly adapted to a 9 - 5 schedule when older generations used to work 8 - 4? Daylight savings slowly convinced society to start the work day 1 hour later.
For maximum health & energy efficiency, though, we probably ought to (just like we probably ought to build our houses so that air conditioning is optional & heating is efficient).