For me after significant journaling and recording, it seems to be when nutrition, sleep and stress are all correctly managed. I can even have several days in a row that are optimal for deep work if I'm careful, but life likes to throw in a wrench from time to time of course.
The big things for me have been to eat a very nutritionally heavy breakfast (I hate eating breakfast, it still takes me forever) and to calorie count both to make sure I'm getting enough and to make sure I'm getting a decent balance of carbs/protein/fat. For sleep, going to sleep early and having wind down time so I sleep well (tea and a book are a winning combo for me there usually).
Stress is of course the difficult one we have the least control over. Exercise is a huge help but that can also change up the nutrition equation. Even then, it's still easy for bad stress days to also muck up the sleep side of the equation and it can take days to get that sorted out.
The big things for me have been to eat a very nutritionally heavy breakfast (I hate eating breakfast, it still takes me forever) and to calorie count both to make sure I'm getting enough and to make sure I'm getting a decent balance of carbs/protein/fat. For sleep, going to sleep early and having wind down time so I sleep well (tea and a book are a winning combo for me there usually).
Stress is of course the difficult one we have the least control over. Exercise is a huge help but that can also change up the nutrition equation. Even then, it's still easy for bad stress days to also muck up the sleep side of the equation and it can take days to get that sorted out.