Why You’re Tired, Stressed & Unfocussed (and how to fix it) - Dr Andrew Huberman
In a Nutshell
High morning cortisol (via sunlight, hydration, caffeine, and movement) paired with low evening cortisol (dim lights, no screens or exercise) builds stress resilience and focus; training top-down prefrontal control through daily "micro-sucks" and deliberate hard choices strengthens impulse suppression circuits that transfer to learning, work, and emotional regulation. Focus and learning require error signals—genuine attempts that create agitation tagged by norepinephrine and dopamine—followed by sleep and self-testing to consolidate gains; presence is achieved by anchoring perception to immediate sensory questions rather than internal states or mind-wandering. Optimization is about principles over rigid protocols: periodize life phases, use breathing tools like physiological sighs and resonance breathing for autonomic control, and transform past trauma through acknowledgment, emotional processing, uncoupling, and contribution rather than staying stuck in feelings.
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High cortisol in the first hour of the day creates elevated mood, focus, and alertness throughout the day while improving stress resilience and learning capacity. A high flat cortisol curve results from insufficient morning cortisol spike and leads to reduced stress resilience, brain fog, and impaired learning.
The morning protocol includes bright light exposure within 30 minutes of waking (sunlight or 10,000 lux artificial light), hydration, caffeine consumption, and exercise within the first three hours. Eating in the first three hours also spikes cortisol, as anything pro-arousal increases cortisol levels.
The final hour before sleep should reverse morning actions: dim overhead lights, reduce screen brightness, limit caffeine, and avoid exercise unless no other time exists. This bookends the day with high cortisol at the beginning and low cortisol at the end.
Bottom-up influences originate from hypothalamic and deep brain structures, driving impulses like eating cookies or excessive scrolling. Top-down influences come from the prefrontal cortex suppressing these impulses. The two-marshmallow test demonstrates this capacity for impulse suppression in children.
Training top-down control involves suppressing immediate impulses. This applies to waiting, learning under stress, listening rather than reacting, and forcing work on difficult tasks. Being an effective human requires building these top-down suppression circuits.
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