OTOH night flight to Africa, try to sleep UK daytime, night flight back to UK - one night off in UK, wash rinse and repeat almost ad infinitum.
Where on earth is the logic or scientific research that led to that?
Trouble is, there doesn’t appear to be any. I have yet to see any published, peer reviewed science that in any way points in that direction.
At 0459 you can do 11hrs and by 0530 you can do 12.5. What good luck that things turned out that way for Ryan/Easy, etc.