162. What Happens in Your Brain After 9PM (Why This Sleep Window Is So Crucial)

162. What Happens in Your Brain After 9PM (Why This Sleep Window Is So Crucial)

From Did We Just Say That? by Kylah Smook & Abi Fernandini

April 20, 2026 · 44 min · Episode 162

About this episode

The episode explores the importance of sleep timing and its effects on brain health, focusing on the glymphatic system.

Have you ever wondered why sleeping from 12am-8am doesn't feel the same as 10pm-6am? They're both 8 hours of sleep.... so why does one feel so much better? In today's episode, Abi and Kylah are breaking down the glymphatic system (not to be confused with the lymphatic system!) and what exactly goes on in your brain from 10pm-12am. LINKS TO THINGS MENTIONED: Why We Sleep book by Matthew Walker WE'VE LAUNCHED OUR PODCAST GROUPCHAT & BOOK CLUB! JOIN FOR $7 A MONTH Have feedb...

People in this episode

Hosts: Kylah Smook, Abi Fernandini

Topics covered

  • sleep
  • glymphatic system
  • brain health
  • sleep cycles
  • wellness

Keywords

  • sleep
  • glymphatic system
  • brain
  • health
  • wellness
  • sleep cycles
  • Matthew Walker

Mentioned in this episode

Books & works: Why We Sleep

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