> Anyway for some people they're more flexible and trainable than others. I'm genuinely happy for your case, but I mainly wanted to point out that not everyone will have the same results.

I wonder if this is something I unlocked during my digital nomad days. There was a period of 2 years in my mid 20’s when I moved from Europe to SFBA and back every 2 or 3 months. 9 hours difference each way, just enough to really screw up your rhythms.