Paper 21 in the ABM Blueprint Independent Research Series. Companion to Paper 20 (PAG-PFC Gating Hypothesis). Together they provide a complete circuit-level account of the 03:00 Syndrome: Paper 20 explains why the brake fails; Paper 21 explains what hits the accelerator. This paper formalizes the Metabolic-Defense Axis: the hard-wired neural relay through which falling blood glucose is transduced into PAG-mediated panic via the Nucleus Tractus Solitarius (NTS)–catecholamine pathway. The model identifies a six-stage cascade: Glucose Drop via hepato-portal sensors. NTS Relay via glutamatergic and noradrenergic projections. Counter-Regulatory Storm with epinephrine surging from ~200 to >500 pg/mL. PAG Column Switch—epinephrine excites 35% of neurons (dorsal/fight-flight) while inhibiting 45% (ventrolateral/freeze). Anandamide Nadir—ECS buffering at one-third of daytime capacity. Sympathetic Veto redirecting blood flow from executive to motor cortex. Key contributions include: * The Triple Depletion Model (PFC gating nadir + ECS nadir + catecholamine maximum converging at 03:00). The Epinephrine Column Switch explaining why Special Forces-profile clients experience qualitatively different nocturnal vs. diurnal anxiety. The Predatory Imminence interpretation of metabolic collapse (the PAG cannot distinguish between a predator and falling blood sugar). Profile-specific metabolic vulnerabilities showing how Architect, Radar, and Special Forces profiles each convert the same metabolic trigger into different clinical presentations. Clinical implications include a metabolic screening protocol for 03:00 anxiety, pre-sleep nutritional interventions, and integration with the Nattevagten (Night Watch) acute regulation protocol. The model provides the neurobiological foundation for nutrition as a primary intervention in the ABM Homeostatic Square.
Flemming Bust (Mon,) studied this question.