Cool. But to guard your sleep a bit more than just caffeine blood concentration is needed. Caffeine will influence your sleep schedule by influencing your cica

Cool. But to guard your sleep a bit more than just caffeine blood concentration is needed. Caffeine will influence your sleep schedule by influencing your cicardian clock via its effect on the underlying signaling. That effect stacks with that of bright light etc, so half-life is not enough. Rule of thump: 2 espressos 3h before normal bedtime will delay your sleep by ca. 40 minutes even without bright light. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4657156/#:~:text=Caffeine%20can%20acutely%20reduce%20levels,in%20rodent%20models%20(15) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4657156/#:~:tex....