The prefrontal cortex uses 'Temporal Integration' to put events on a timeline. When this fails in ADHD, logic is lost. A neurotypical brain says, "I have 14 hours until work, I will enjoy them." The ADHD brain says, "An overwhelming event is on the horizon. I cannot begin any new task, because if I get distracted, I will miss the transition."
This is the 'Waiting Mode' glitch. Your nervous system locks you into a holding pattern. You cannot engage in a high-dopamine hobby (like painting or video games) because the brain fears it will hyperfocus and fail to be 'ready' for the Monday threat.
Additionally, the Sunday Scaries are heavily tied to 'Transition Trauma.' Shifting from the unstructured chaos of the weekend to the rigidly masked, high-friction environment of the office requires an immense surge of dopamine—dopamine you do not have. The body goes into a cortisol stress-response simply anticipating the pain of that gear-shift.
