I feel like I have two currencies at work, one being time and the other being mental fatigue. Average time wasting (snacking, reading, going for a walk) only co

I feel like I have two currencies at work, one being time and the other being mental fatigue. Average time wasting (snacking, reading, going for a walk) only consumes time, but coding and meetings both cause mental fatigue. It’s worse for my productivity than if I spent an hour laying outside.