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Here’s a clean summary table of the concept:
🌅 Summary Table – Cortisol’s Morning Surge (Cortisol Awakening Response, CAR)
| Aspect | Details |
|---|---|
| What is it? | A rapid spike in cortisol (up to 60%) within 30–45 minutes after waking up. |
| Name | Cortisol Awakening Response (CAR) |
| Function | Helps the body transition from sleep to alertness; boosts energy, focus, and readiness for the day. |
| Why It Happens | Part of the body’s circadian rhythm—regulated by the brain’s hypothalamic-pituitary-adrenal (HPA) axis. |
| Benefits | Improves cognitive function, supports immune readiness, and enhances metabolic activity in the morning. |
| Disruption Causes | Irregular sleep, stress, burnout, depression, or shift work can blunt or exaggerate CAR. |
| Clinical Relevance | CAR is a biomarker for stress resilience, HPA axis health, and is used in research on mental health and burnout. |
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