You sit down in the morning with a vague sense of things you should do. By noon, half the day is gone and you've barely scratched the surface. By evening, you wonder where the time went.
This isn't a discipline problem. It's a structural one.
The Planning Gap
Research on implementation intentions by psychologist Peter Gollwitzer (1999) found that people who define what they'll do and when they'll do it are 2 to 3 times more likely to follow through - compared to people who simply intend to get things done.
Gollwitzer, P.M. (1999). Implementation intentions. *American Psychologist*
The problem? Most people skip this step entirely. Not because they're lazy, but because structuring your day is itself a task - and it competes with the same limited cognitive resources you need for actual work.
This is where decision fatigue enters. Every "what should I do now?" moment throughout the day drains the same mental energy pool. The more unstructured your day, the more micro-decisions you make - and the worse those decisions become as the day goes on.
So the day drifts. Not because you don't care, but because the structure was never there to begin with.