Summary
Dr. Andrew Huberman breaks down the latest research on habits, the brain, sleep, supplements, and his personal go-to protocols. Covers why high cortisol isn't always bad, updated views on supplements, and practical strategies for reclaiming focus and mental clarity.
Key Points
- Updated perspective on cortisol - high levels aren't always problematic
- Current supplement stack and what's changed
- Sleep optimization protocols for 2026
- Breaking bad habits using neuroscience-backed methods
- The latest on focus and attention enhancement
- Personal routines and daily practices
Key Moments
Morning cortisol spike requires bright light exposure
Huberman explains the cortisol awakening response and how viewing bright light within the first hour after waking amplifies cortisol through a unique circadian pathway, setting up calmness for the rest of the day.
"However, in the first hour after waking, your brain's circadian clock has a unique privileged pathway that is separate from the HPA axis, where it can amplify cortisol only in that first hour."
Cold plunge reduces cortisol despite common claims
Huberman debunks the claim that cold plunges increase cortisol, citing data showing cortisol actually goes down while adrenaline and dopamine go up during cold exposure.
"You could jump in a 40-degree Fahrenheit cold plunge. Doesn't actually increase your cortisol. All this nonsense going around the internet about, you know, women shouldn't do a cold plunge. And if they do, not as cold. Okay, maybe, but it's always attributed to increases in cortisol. Cold plunge reduces your cortisol levels. You can look at the data."
Morning routine sets entire circadian rhythm
Huberman describes how spiking cortisol in the first hour with bright light, hydration, and exercise is the first domino for all circadian rhythms governing daytime alertness and nighttime sleep.
"Getting the body into a high cortisol state early sets you up for being in a low cortisol state in the afternoon and evening."
Melatonin and cortisol inverse relationship for sleep
Huberman explains how melatonin peaks during the first hours of sleep when cortisol is at its lowest, and how bright light in the morning helps clear residual melatonin through the eyes.
"Hopefully, it's dim in the room. You go to sleep. Your cortisol is then at its absolute lowest levels for the entire 24 hours. And by the way, this is the same time when melatonin, the sleepy hormone, is at its highest levels."
