The thing that changes sleep isn't actually the clock changing. It's that in combination with "Our business/school opens at 8 AM every day" and the sun behaving decidedly different from that.
But anyone who has flown between the East Coast and West Coast of the US knows that the sun doesn't determine when you feel tired or when you wake up: your sleep hygiene does.
I used to fly to SF from Boston and wanted to go to bed at 7-8pm every night and then would wake up at 4am. Not because of sunlight but because my body was used to that schedule.
> Researchers said the wavelengths at sunrise and sunset have the biggest impact to brain centers that regulate our circadian clock and our mood and alertness.
https://www.sciencedaily.com/releases/2020/02/200220141731.h...
But if I take a short trip from the East Coast to the West Coast in the US, I often go to bed on the early side and wake up early.
I find the 3 hour difference to the west coast to be way harder to adjust to than the 5 or 6 hour (depending on destination) difference to Europe. I'm a zombie for a week going to California and spring right back to eastern time going home.
Going to Europe, it's about a day to fully kick over to the time change in either direction. Admittedly, it's a rough day headed east that usually involves an afternoon nap, but I've come to despise the three hour change to Pacific time far more.
Tech jobs generally don't have set times to be in. But most jobs do.
Teaching teenagers responsibility (to go to sleep on time and wake up on time) is an important skill to have.