“Self-control is a finite resource. You can only ask so much of yourself each day” – says Nick Crocker. He continues: “You’ll snap or warp or splinter if you ask too much. You have a limited capacity to direct yourself a certain way. It’s worth considering where that directive capacity goes every day“.
Seen from that perspective, we need to be careful in our utilization of self control and be wary not to exceed our capacity in a given day.
This probably means that if you realize you have used a fair bit early, you need to make sure you don’t put yourself in situations where significant self-control is required.
However I do believe that certain exercises of self-reflection and physical exercise can increase one’s self-control reserve when that is really needed.
In any case, if you feel you are exhausting your self-control reserves don’t explode yet! Maybe wait until the next day to tackle the new situation?