Harder to guess because Alaskans still have circadian rhythms - that's a basic biological function built into your brain, that a lot of life on earth evolved with. (I assume circadian rhythm predates humans, because other animals have it, too.)

In a tidally locked world, there would be no circadian rhythm, at least not one driven by the day/night light cycle. I mean yeah they'd probably still need to sleep but the underlying biological mechanisms would be completely different