Ask Matthew Walker about sleep

Ph.D., a guest on Andrew Huberman, Peter Attia, Rangan Chatterjee, Rhonda Patrick, and Steven Bartlett.

35 episodes, 50.2 hours of tape. Every answer comes from those episodes, with the minute it was said.

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Popular questions

Answered from the tape, with the episode and the minute. Where a guest was in the room, it says so.

  1. How many hours before bed should you stop caffeine?

    “the rule of thumb here would be try to cut yourself off from caffeine probably at least 10 or so hours before you expect to go to bed”

    ▶ 22:34 · Dr. Matt Walker: Protocols to Improve Your Sleep | Huberman Lab Guest Series · Andrew Huberman's channel

  2. How much does body temperature need to drop to fall asleep?

    “you need to drop your core body temperature and your brain temperature by a little less than 1° cus 2 to 3 Dees fhe to get to sleep and stay asleep”

    ▶ 19:20 · Dr. Matt Walker: Protocols to Improve Your Sleep | Huberman Lab Guest Series · Andrew Huberman's channel

  3. How little evening light does it take to suppress melatonin?

    “it takes very little light even from artificial sources to disrupt your circadian rhythm and quash melatonin as little as 15 seconds of bright light in the evening”

    ▶ 13:55 · Dr. Matt Walker: Protocols to Improve Your Sleep | Huberman Lab Guest Series · Andrew Huberman's channel

  4. What melatonin dose actually helped sleep in studies?

    “the optimal doses for where you do get sleep benefits in the populations that we've looked at, are somewhere between 0.1 and 0.3 milligrams of melatonin”

    ▶ 01:49:34 · The Science & Practice of Perfecting Your Sleep | Dr. Matt Walker · Andrew Huberman's channel

  5. How long a nap improved performance in the NASA study?

    “naps of little as 26 minutes, improved mission performance by 34%, and improved daytime alertness by 50%”

    ▶ 02:22:51 · The Science & Practice of Perfecting Your Sleep | Dr. Matt Walker · Andrew Huberman's channel

  6. Does a worry journal help you fall asleep faster?

    “keeping one of those journals decreased the time it takes you to fall asleep by 50%, five, zero”

    ▶ 02:56:16 · The Science & Practice of Perfecting Your Sleep | Dr. Matt Walker · Andrew Huberman's channel

The episodes

The chat searches all of them.

Episode Show Length Aired
World No.1 Sleep Expert: Magnesium Isn’t Helping You Sleep! This Habit Increases Heart Disease 57%! Steven Bartlett 137 min Nov 2025
Dr. Matt Walker: The Science of Dreams, Nightmares & Lucid Dreaming | Huberman Lab Guest Series Andrew Huberman 153 min May 2024
Dr. Matt Walker: Improve Sleep to Boost Mood & Emotional Regulation | Huberman Lab Guest Series Andrew Huberman 135 min May 2024
Dr. Matt Walker: Using Sleep to Improve Learning, Creativity & Memory | Huberman Lab Guest Series Andrew Huberman 148 min Apr 2024
Dr. Matt Walker: How to Structure Your Sleep, Use Naps & Time Caffeine | Huberman Lab Guest Series Andrew Huberman 138 min Apr 2024
Dr. Matt Walker: Protocols to Improve Your Sleep | Huberman Lab Guest Series Andrew Huberman 162 min Apr 2024
Dr. Matt Walker: The Biology of Sleep & Your Unique Sleep Needs | Huberman Lab Guest Series Andrew Huberman 179 min Apr 2024
WHY YOU'RE ALWAYS TIRED - Big Myths Ruining Your Sleep & How To Get The Best Sleep Of Your Life! Rangan Chatterjee 172 min Aug 2023
Sleep Expert REVEALS How Caffeine DESTROYS Your Sleep, Focus & Productivity | Matthew Walker Rangan Chatterjee 147 min Mar 2023
The World’s No.1 Sleep Expert: The 6 Sleep Hacks You NEED! Matthew Walker Steven Bartlett 125 min Mar 2023
The connection between sleep and Alzheimer’s disease | Peter Attia, M.D. & Matt Walker, Ph.D. Peter Attia 10 min Jul 2022
The connection between heart disease & sleep deprivation | Peter Attia, M.D. & Matt Walker, Ph.D. Peter Attia 11 min Jul 2022
Fighting cancer and improving immune function with sleep | Peter Attia, M.D. & Matt Walker, Ph.D. Peter Attia 13 min Jul 2022
The impact of sleep on lifespan & healthspan | Peter Attia, M.D. & Matt Walker, Ph.D. Peter Attia 3 min Jul 2022
Is it bad to eat food too close to bedtime? | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 1 min Jun 2022
How is appetite affected by our sleep quality ? | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 2 min Jun 2022
Dieting while sleep deprived | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 3 min May 2022
How fasting can impact sleep | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 8 min May 2022
Alcohol, Sleep, & Stress: A Self-Fulfilling Prophecy | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 8 min Mar 2022
Do THC and CBD help you sleep? | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 12 min Mar 2022
Stress, Cortisol, & Sleep: An Awful Feedback Loop | Peter Attia, M.D. & Matthew Walker, Ph.D. Peter Attia 5 min Mar 2022
DO THESE 4 Daily Things To PREVENT DISEASE! | Rangan Chatterjee Rangan Chatterjee 125 min Sep 2021
DO THESE 4 Things To Help PREVENT Alzheimer's & Dementia! | Matthew Walker & Rangan Chatterjee Rangan Chatterjee 114 min Aug 2021
The Science & Practice of Perfecting Your Sleep | Dr. Matt Walker Andrew Huberman 186 min Aug 2021
3 WAYS To Improve Your SLEEP QUALITY Today! | Matthew Walker & Rangan Chatterjee Rangan Chatterjee 95 min Jun 2021
SLEEP EXPERT Reveals How To Optimize Your Sleep To LIVE LONGER! | Matt Walker Rangan Chatterjee 31 min May 2021
How To Improve Your Sleep And Why You Should | Professor Matthew Walker | Audio Only Rangan Chatterjee 94 min Jan 2021
#126–Matthew Walker, Ph.D.: Sleep & immune function, chronotypes, hygiene tips, & his book Peter Attia 101 min Aug 2020
#49–Matt Walker, Ph.D., on Sleep (Part 3 of 3): Effects of poor sleep on metabolism & performance... Peter Attia 121 min Jan 2020
#48–Matt Walker, Ph.D., on Sleep (Part 2 of 3): Heart disease, cancer, causes of sleep disruption... Peter Attia 124 min Jan 2020
#47–Matt Walker, Ph.D. on Sleep (Part 1 of 3): Dangers of poor sleep, dementia risk, mental health.. Peter Attia 103 min Jan 2020
Why Sleep is the Most Important Pillar of Health with Professor Matthew Walker | FBLM Podcast Rangan Chatterjee 81 min Jul 2019
Dr. Matthew Walker on Sleep for Enhancing Learning, Creativity, Immunity, and Glymphatic System Rhonda Patrick 157 min Feb 2019
Why We Sleep with Matthew Walker PART 2 | Feel Better Live More Podcast Rangan Chatterjee 42 min Jul 2018
Why We Sleep with Matthew Walker PART 1 | Feel Better Live More Podcast Rangan Chatterjee 48 min Jul 2018

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