Marshall's observation: "most of the bad decisions you make, you make in the later afternoon, evening, or night." Judgment decays as the day wears on — for almost everyone, we are apt to act stupider later. He notes people have slightly different rhythms, but the direction holds for the majority.
The defensive play, if you are a typical decayer: do not fight it. As you start to fade, get to bed as early as you can, and limit any damage or backsliding to other production or habits during the low-judgment window. Treat late-day decisions with suspicion and defer consequential choices to the high-judgment morning.
This is the temporal twin of "spend your best hours on your hardest work" — but applied to decisions rather than output: schedule the choices that matter most when the instrument making them is sharpest.
Cross-domain: decision hygiene, negotiation timing, risk management, addiction relapse patterns. The general rule it supports: never decide anything important when depleted.
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*Source: [[Book Inventory/Progression|Progression]] (Sebastian Marshall, 2016) — Upstream Effects #5 — Yesterday*