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Morning Vigor Index

Meaning

The Morning Vigor Index is a quantitative or meticulously subjective measure utilized in clinical practice to assess an individual’s self-reported level of physical energy, mental clarity, and overall sense of readiness immediately upon waking from sleep. This index serves as a practical, high-level clinical proxy for the functional integrity of the Hypothalamic-Pituitary-Adrenal (HPA) axis and the measurable efficiency of the nightly restorative processes, which include deep sleep and cerebral detoxification. A consistently high index indicates an optimal diurnal cortisol rhythm and robust, complete nocturnal recovery.