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Trading requires sustained attention, pattern recognition, and emotional control, and those capacities degrade with fatigue. In my records, trades taken in the last hour of a long session were worse than those at the start, with more rule violations and lower average R. This is not mysterious: decision fatigue makes people more impulsive and less able to wait. The practical solution is to limit the length of trading sessions and define a clear end time. I trade a fixed window, usually the London morning, and then close the platform regardless of what is happening. If I am on a roll, I still stop, because the risk of a mistake rises with tiredness. I also take short breaks during the window, standing up, drinking water, and looking away from the screen for a few minutes. Sleep matters too: I noticed my results on days after poor sleep were meaningfully worse, so I reduce size or skip on those days. You can test this by adding sleep hours and energy level to your journal. The data may surprise you and motivate better habits.

A fixed window works for me as well. I trade the first two to three hours of Tokyo on USDJPY and close the platform before Frankfurt opens. On the days I stayed for London, my late trades were clearly worse in the journal, even though London has more movement.