Category
Where your output comes from, and what it quietly borrows against tonight. Caffeine timing, training windows, the afternoon dip, naps, and focus that does not need to be forced.
6 live · 0 upcoming
The advice is usually "no caffeine after 2pm." That number is made up. The real cutoff depends on one thing you can calculate in about ten seconds — and for most people it lands earlier than they'd like.
Twenty minutes and ninety minutes are both correct answers. Forty-five is the one that ruins your afternoon. Which one you want depends on what you are trying to buy.
The afternoon dip is a real circadian event, not a character flaw or a caffeine deficiency. Treating it with more coffee fixes two hours and bills tonight for it. Here is what actually works.
You went from one cup to four and now none of them do anything. That is not you needing more coffee — it is your brain growing extra receptors to cancel it out. Here is the mechanism, and how to get the effect back.
Two nights of short sleep moves your hunger hormones roughly 18% down on satiety and 28% up on hunger — and steers the craving specifically toward carbohydrate. It is not weak willpower. It is endocrinology.
Strength and power peak in the late afternoon, tracking core temperature. But the session you actually do beats the physiologically optimal one you skip — and evening training wrecks sleep far less than people claim.