I have worked nights for more than sixteen years, long before it was a professional advantage. Here is what makes a decade of US-hours consulting sustainable rather than exhausting.
Protect the overlap, not the hours
Four hours of genuine overlap with a US client beats eight hours of availability. Everything synchronous goes there; everything else is written.
Write everything down
Decisions live in documents, not calls. A client in another time zone should never wait twelve hours to find out what was agreed.
