BOAC
What I was suggesting is that it is a possibility. In my career when I was a first officer (BOAC) I have operated in heavy crew situations where the captain indeed would go back to the bunk with instructions of not to be disturbed unless absolutely necessary. If the crew thought they could penetrate the line they may not have disturbed him. What followed next probably precluded him coming up anyway. And there are certain pilot types who would prefer not to disturb him on principle. It is dangerous to disgard a possibility just because it it not something either I or you would do