School V · Lesson 09 of 15
Stress, Sleep and the Body
Core idea: the mind runs on a body. Stress, sleep and movement shape how well you think, feel and decide.
The Lesson
You can't think clearly on a body running on empty. Wisdom isn't only a mental skill. It depends on the machine underneath.
Stress. When you face a threat, your body triggers what physiologist Walter Cannon named the fight-or-flight response: adrenaline and cortisol rise, the heart speeds up and the body gets ready to act. That's useful for a near-miss on the highway. The problem is when it never switches off. Long-term stress from money worries, conflict and constant noise keeps the body on alert, and over time that wears on sleep, mood, focus and health.
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Applied Wisdom
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