The Matt Walker Podcast

• #116 - 40 Hz Brain Stimulation

  Matt ventures into the realm of 40 Hz "gamma" rhythms - the conductor of the biological orchestra during high-order cognition - to explore how non-invasive light and sound stimulation can entrain brain activity, nudging neurons into synchrony. Crucially, Matt examines ground-breaking Alzheimer’s research where this rhythm rallies the brain's immune cells to clear toxic plaques, potentially stabilizing memory and preventing atrophy in early-stage patients.Beyond cognition, Matt uncovers a neurobiological paradox: high-frequency stimulation can actually induce sleepiness by triggering a surge in adenosine. He discusses findings suggesting 40 Hz therapy acts as a "paradoxical lullaby," improving insomnia and regulating mood via the prefrontal cortex. While remaining grounded in scientific skepticism, Matt considers if this non-pharmacological intervention could become a vital addition to our future health toolkit.Please note that Matt is not a medical doctor, and none of the content in this podcast should be considered medical advice in any way, shape, or form, nor prescriptive in any way.This episode is supported by podcast partner Pique. Their Radiant Skin Duo pairs Sun Goddess Matcha and B·T Fountain to target stress and deep cellular hydration from the inside out. Get 20% off sitewide for life plus an exclusive free holiday bundle at piquelife.com/mattwalker.In a supplement industry where trust is critical, Matt uses podcast sponsor Puori. Their protein powders are free from hormones, GMOs, and pesticides, with every single batch third-party tested for over 200 contaminants. For protein you can trust, save 20% at puori.com/mattwalker.Another sponsor is UPLIFT Desk whose V3 Standing Desk helps boost circulation and concentration with a sturdy, customizable design that gets you moving while you work. Visit upliftdesk.com/mattwalker and use code MATTWALKER for 4 free accessories and a 15-year warranty.As always, if you have thoughts or feedback you’d like to share, please reach out to Matt:Matt: Instagram @drmattwalker, X @sleepdiplomat, YouTube: https://www.youtube.com/channel/UCA3FB1fOtY4Vd8yqLaUvolg

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• #115 - Sleep Deprivation for Depression

  The counterintuitive use of sleep deprivation as a rapid treatment for major depression finds itself squarely in Matt’s spotlight today. He begins by discussing its origins in the 1970s, where one night of wakefulness induced temporary remission in 40-60% of patients, and goes on to note that this effect is fragile, with an 83% relapse rate after recovery sleep, pointing to a paradox where sleep itself may be depressogenic for some.Matt reviews the neuroscientific explanations, including the "overarousal hypothesis," which suggests the therapy works by calming hyperactive brain regions like the amygdala. The episode also covers chronotherapy's role in extending these benefits before presenting a modern conundrum: a 2022 meta-analysis that challenges the standalone efficacy of sleep deprivation, pitting decades of clinical observation against rigorous scientific review. This sets the stage for a scientific reckoning, where the dream of a fast-acting cure confronts the sobering reality of modern evidence.Please note that Matt is not a medical doctor, and none of the content in this podcast should be considered medical advice in any way, shape, or form, nor prescriptive in any way.As a huge supporter of mission-driven companies, Matt recommends new partner Branch Basics. Their plant- and mineral-based ‘The Concentrate’ is tough on kitchen grease yet gentle enough for baby toys, helping you create a toxin-free home. Get 15% off with code MattWalker at branchbasics.com/mattwalker.Another sponsor, Shopify, made launching Matt's merchandise incredibly smooth with its integrated sales system. Shopify simplifies everything from online stores to in-person sales. Start your exclusive trial and see for yourself at shopify.com/mattwalker.A third sponsor this week, LMNT, offers a science-based electrolyte drink with no sugar or artificial ingredients. Try their new limited-time Lemonade Salt flavor, available May 20th! Get eight free sample packs with any order at drinklmnt.com/mattwalker. Stock up on this summer flavor while it lasts!As always, if you have thoughts or feedback you’d like to share, please reach out to Matt:Matt: Instagram @drmattwalker, X @sleepdiplomat, YouTube https://www.youtube.com/@sleepdiplomatmattwalker9299

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• #114 - How to Boost your HRV

  Matt delves into Heart Rate Variability (HRV), the subtle variation in timing between each heartbeat. He explains that a healthy heart is like a "jazz drummer," not a rigid metronome, and a higher HRV reflects a resilient body that can adeptly balance its stress and rest systems. This episode unpacks the science behind HRV and explores the actionable strategies you can employ to improve this critical marker of your overall health.Matt then explores the key lifestyle factors that significantly influence your HRV. He highlights sleep as the most powerful tool for nightly recalibration, explaining how even moderate sleep loss can suppress HRV. The discussion also covers how exercise, especially HIIT, boosts adaptability, and how stress management techniques can calm the system's "static noise." Finally, he touches on the importance of a consistent circadian rhythm and avoiding substances like alcohol to protect your heart’s healthy variability.Please note that Matt is not a medical doctor, and none of the content in this podcast should be considered medical advice in any way, shape, or form, nor prescriptive in any way.Craving more energy, better metabolism, and immunity? Discover Pique's Nandaka, a ceremonial cacao superfood blend for calm, sustained energy without the crash. Thanks to this wonderful podcast partner, you can now get 20% off for life at pique.com/mattwalker using code MattWalker.In a supplement industry where trust is critical, Matt uses podcast supporter Puori. Their protein powders are free from hormones, GMOs, and pesticides, with every single batch third-party tested for over 200 contaminants. For protein you can trust, save 20% at puori.com/mattwalker.Another partner, AG1, is one that Matt relies upon for his foundational nutrition. Their new science-backed Next Gen formula features upgraded probiotics, vitamins, and minerals. Start your subscription today to get a FREE bottle of Vitamin D3+K2 and 5 free travel packs with your first order at drinkag1.com/mattwalker.As always, if you have thoughts or feedback you’d like to share, please reach out to Matt:Matt: Instagram @drmattwalker, X @sleepdiplomat, YouTube: https://www.youtube.com/channel/UCA3FB1fOtY4Vd8yqLaUvolg

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• #113 - Modafinil: An All-Nighter In A Pill?

  Diving into the controversial world of Modafinil, the "all-nighter in a pill", Matt begins with the story of Olympic sprinters using the narcolepsy drug as a loophole for a competitive edge. He then unpacks the science of how Modafinil affects brain chemistry to boost wakefulness and cognition, tracing its evolution from a medical treatment to a performance enhancer for the military, Wall Street, and students, all attempting to push human limits by cheating sleep.Despite its potent effects, Modafinil carries significant risks and ethical dilemmas. Matt discusses its side effects, potential for psychological dependency, and the unknowns of long-term use. The episode examines complex questions of fairness and the potential for "cognitive inequality." Ultimately, Matt argues that while the drug masks fatigue, it cannot replace the vital restorative functions of natural sleep. The "sleep debt" must eventually be repaid, as true well-being depends on this biological necessity, not a pill.Please note that Matt is not a medical doctor, and none of the content in this podcast should be considered medical advice in any way, shape, or form, nor prescriptive in any way.One of this week's sponsors, LMNT, offers a science-based electrolyte drink with no sugar or artificial ingredients. Try their new limited-time Lemonade Salt flavor, available May 20th! Get eight free sample packs with any order at drinklmnt.com/mattwalker. Stock up on this summer flavor while it lasts!Another sponsor, David, is a revolutionary new protein bar developed with Dr. Peter Attia. It boasts an unbeatable ratio: 28g of protein and 0g of sugar in just 150 calories. Incredibly satiating with six amazing flavors, it’s perfect for muscle health. Visit davidprotein.com/mattwalker and buy 4 cartons to get a 5th FREE!As always, if you have thoughts or feedback you’d like to share, please reach out:Matt: Instagram @drmattwalker, X @sleepdiplomat, YouTube https://www.youtube.com/@sleepdiplomatmattwalker9299

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• #112 - How Synesthesia Secretly Shapes Your Reality

  Matt explores the fascinating world of synesthesia today, challenging the notion that it's a rare quirk by proposing a bold claim: in subtle ways, we are all synesthetes. This idea is powerfully demonstrated by the famous "Bouba/Kiki" test, which reveals our brain's innate tendency to connect abstract shapes and sounds. The episode argues that this fundamental cross-wiring is not a mere curiosity but the very operating system for human thought, shaping everything from our metaphors to the development of language itself.The journey continues by exploring how these sensory perceptions can be programmed externally, as shown in a remarkable study linking synesthetes' color associations to a popular Fisher-Price toy. Matt also discusses the cognitive superpowers that can accompany synesthesia, like superior memory, and its profound connection to autism. Ultimately, the episode illuminates how everyday phrases like "feeling blue" are not just figures of speech, but echoes of the synesthetic software running in all our brains, constantly mixing senses to build our unique perception of reality.Please note that Matt is not a medical doctor, and none of the content in this podcast should be considered medical advice in any way, shape, or form, nor prescriptive in any way.Craving more energy, better metabolism, and immunity? Discover Pique's Nandaka, a ceremonial cacao superfood blend for calm, sustained energy without the crash. Thanks to this wonderful podcast partner, you can now get 20% off for life at pique.com/mattwalker using code MattWalker.In a supplement industry where trust is critical, Matt uses podcast supporter Puori. Their protein powders are free from hormones, GMOs, and pesticides, with every single batch third-party tested for over 200 contaminants. For protein you can trust, save 20% at puori.com/mattwalker.Podcast partner UPLIFT Desk helps Matt combat the drain of sitting all day. By making it easy to switch between sitting and standing, he stays active and focused, boosting his energy and wellbeing. You can enjoy these many benefits, too, by visiting upliftdesk.com/MATTWALKER and using code MATTWALKER for a special discount and free accessories.As always, if you have thoughts or feedback you’d like to share, please reach out to Matt:Matt: Instagram @drmattwalker, X @sleepdiplomat, YouTube: https://www.youtube.com/channel/UCA3FB1fOtY4Vd8yqLaUvolg

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