1:00 – 1:30 PM HARD CUTOFF
Last Coffee Window ⚠️
This is your absolute last chance for caffeine today. After 1:30 PM, no coffee, no tea, no energy drinks, no chocolate.
⚠️ Caffeine half-life: 3–7hrs (avg ~5hrs). Varies by genetics. After 1:30 PM it disrupts sleep architecture — reduced deep sleep and REM even if you "fall asleep fine."