Planes and poorly ventilated short-term rentals impose subtle hypoxia and CO2 retention that shave 10–30% off decision-grade cognition — often invisible to standard sleep and caffeine fixes. This episode gives a compact, evidence-minded protocol you can execute on any long-haul flight and in the first eight hours after arrival. I explain the physiology of reduced arterial oxygen and elevated inhaled CO2, show which real-time metrics to track (SpO2, end-tidal CO2 proxy, HRV trends), and deliver a 3-step pulmonary reset: targeted nasal breathing + ventilation sequencing on-board, a portable oxygen-mimetic and diaphragmatic priming on arrival, and a 2-hour recovery anchor combining light exposure and glycemic control. Each step includes precise thresholds, what to log, and a common operational mistake that nullifies the effect. Feasible with a travel kit you can pack and measurements you can record on your phone.

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