Smash Notes
The Science of Sleep: What Matthew Walker and Other Experts Say on Podcasts
Sleep comes up on podcasts constantly, and few guests explain it as clearly as Matthew Walker, the UC Berkeley neuroscientist and author of Why We Sleep. He has walked through the research on the TED stage, on The Joe Rogan Experience and on The Peter Attia Drive, and other shows have covered sleep from the side of parents, founders and scientists. This page brings 15 of those moments together. Each note is one question with a short answer and the exact minute it comes up in the episode, so you can hear the full explanation in the speaker's own words. The notes are grouped into three parts: how much sleep you need, what happens when you don't get enough, and practical habits for sleeping better. These are summaries of what guests said on air, not medical advice. If you're struggling with sleep, talk to a doctor.
How much sleep do you need?
-
How Much Sleep Should You Get For Optimal Performance
Walker's benchmark is that performance measurably drops below seven hours, so he recommends seven to nine.
-
How Much Sleep Should Kids Be Getting
A simple test for parents: a child who wakes up on their own without an alarm is probably getting enough.
-
What Are Unique Sleep Challenges That Only Apply To Founders
Steli and Hiten explain why always-on founders often get by on five or six hours.
-
Why Are We Still So Sleepy When We Wake Up
A guest on Bill Nye's show explains why the brain needs about half an hour to fully switch on after waking.
What happens when you don't sleep enough
-
Why Do We Need Sleep For Our Brain
Walker describes a study in which sleep-deprived students showed a 40% deficit in forming new memories.
-
How Does Sleep Deprivation Impact Our Immune System
He says even one night of four hours' sleep measurably weakens the immune system.
-
Are Aging, Dementia And Alzheimers Related
Walker points to research linking disrupted deep sleep to memory decline.
-
What Happens When Your Body Undergoes Sleep Deprivation
Short sleep sends the brain a false starvation signal, which drives hunger up.
-
What Is The Best Performance Enhancement Drug
Walker calls sleep the greatest legal performance enhancer and explains what short sleep does to athletes.
How to sleep better
-
How Can I Fix My Sleep
His two biggest tips are a regular schedule and a cool bedroom, around 65°F.
-
How Does Light Impact Our Sleep
Why an hour of reading on a tablet at night can push back melatonin by hours.
-
Why Does Eating Carbs Before Bed Make It Harder To Sleep
Carbs raise core body temperature, which needs to fall for sleep, so lean toward protein if you're hungry.
-
What Is The Optimum Time To Stop Eating Before Bed
Walker's rule of thumb is to stop about three hours before bed and go to bed neither too full nor too hungry.
-
Are Sleeping Pills Any Good
Walker's short answer: sleeping pills don't produce natural sleep.
-
What Levels Of Sleep Do Devices Such As Aura, Whoop, Fitbit, And Apple Watch Detect
Sleep trackers do a decent job measuring how long you slept but struggle to tell sleep stages apart.