Everyone owns their time and is responsible for what they say or do ...
There are small conflicts in people once we get away from the planning we have to carry out any activity or action. There are cases like you that mention that the brain stops wanting to continue with the activities without any reason when we deviate from such planning.
We must be proactive, plan and, in spite of, that things do not arise many times, how, we propose them,
Continue executing the task or activity that is running, maybe I did not finish it or maybe yes, but in the case of not doing it, we will advance much more than if we stop without doing anything.