DPF Series: The Hydration Window The 6–10 AM CO₂-Fragile Phase That Controls Bile, RAAS, and Voltage Stability, Lantern of Sulfur, Concept B1b, v2026.09

This preprint defines the Hydration Window: a reproducible 6–10 AM timing gate in which hydration becomes highly dependent on CO₂ buffering margin, RAAS switching/reactivity, and bile temperature/viscosity. Within Downward Pressure Failure (DPF) terrain, mis-timed morning hydration—especially acids, salt loading, potassium, and electrolyte mixes—can trigger a predictable cascade: CO₂ drop → sympathetic surge → bile stall (“freeze”) → chloride bracing → RAAS activation → nausea / NAGMA / blood pressure volatility. In contrast, low-signal sequencing during this window—ginger-first, warm water, micro-MCT, a tiny fat buffer, and DryWater after ~8 AM—stabilizes bile permissiveness and autonomic threshold, reduces morning force-intolerance, and determines the day’s downstream tolerance margin. This gate explains a core paradox: the same hydration that stabilizes at noon can destabilize at dawn because terrain chemistry and buffering state are not constant across the day. Series placement: Vertical Terrain Axis — Downward Pressure Failure (DPF) series; Concept B1 (Timing Gates). B1a defines the Hydration Window (6–10 AM) and functions as the morning execution gate that governs when hydration inputs become stabilizing versus destabilizing in CO₂-fragile, RAAS-reactive terrain. (B1b: Acid Window, 10 AM–5 PM.) Assumes: Concept A (Gates: Conditional Containment and the Preservation of Coherence Under Load, DOI: 10.5281/zenodo.17931104) and DPF execution conditions (DPF, DOI: 10.5281/zenodo.18202813).