The Dreaming Brain with Matt Walker

About This Episode

What’s the real difference between dreaming and waking consciousness?  Neil deGrasse Tyson and co-host Chuck Nice and Gary O’Reilly sit down with sleep expert Matt Walker to answer fan questions about the most mysterious thing humans do every single night: sleeping & dreaming. What’s the science behind your sleep paralysis demon?

Why did evolution keep sleep? We explore why sleep stuck around and what the latest in sleep research looks like. Could genetic short sleepers hold the key to “zip-filing” sleep into fewer hours? Could we ever reprogram our genetics to not need sleep at all? We discuss if this is possible and whether losing the ability to dream would be detrimental.

What does dreaming actually do? Matt explains how REM sleep produces informational alchemy and why dreaming may be the biological basis of human creativity and overnight emotional therapy. Neil shares how he slept eleven hours the night after 9/11, and Matt connects that to the brain’s drive for more sleep when processing large amounts of information.

If the dreaming brain can generate an entire universe without sensory input, what does that say about waking consciousness? Is waking life itself just a controlled hallucination tethered to time? We break down the difference between waking and dreaming as well as the brain’s cleansing mechanism: the gylmphatic system. How does its failure to clear toxic proteins connect directly to Alzheimer’s disease? The episode covers sleep stages and cycles, why sleep inertia makes waking from deep sleep so hard, and what parasomnias (like sleepwalking and sleep paralysis) reveal about the porous boundary between waking and sleeping consciousness. Plus, a question about how astronauts’ sleep is impacted by being in space.

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