How do you balance team collaboration when core hours drain your remote devs?

I thought establishing a strict two-hour daily overlap was the fair way to keep our global team aligned.

But I recently realized one of our team members was silently burning out just to make those mandatory sync calls fit their local time.

Spreadsheet schedules look great until you factor in real life sleep cycles.

We started testing rotating core windows to share the burden but it still feels like a compromise.

For anyone running cross border teams what realistic rules do you use to keep things moving without relying on forced live hours?