https://healthblog.uofmhealth.org/heart-health/why-daylight-...
At any rate, yes, the sun rising at 4am would also stress me out. In fact, given that I'm in a position to tell you what it's like in a place where that happens for part of the year, I can inform you from personal experience that it is indeed disruptive to circadian rhythm to have the sun rise even "moderately" early.
I'm sure people in Alaska think you're a great person for telling them they don't matter, though.
Here in Seattle, sunrise is as early as 5:10am or so in the middle of June. However, with civil twilight included, you're looking at a pretty bright sky from 4:30am to 10pm.
We're not even that far north here, but waking up out of a light sleep at 4am can certainly be bothersome.
My takeaway is that it's a matter of personal predisposition. Maybe people should move to the east or west end of their timezone based on their light-vs-dark time-of-day preferences. :)
How about DST with a 12 hour offset?