Ever get a full eight hours of sleep and still wake up exhausted? You're not imagining it, and it's not a discipline problem. There's a specific reason sleep quantity doesn't guarantee sleep quality, and once you understand it, a lot of your bad mornings will suddenly make sense.
In this episode, we sit down with Dr Jemma King — behavioural scientist, sleep researcher and author of the new book Sleep First — to unpack exactly why this happens, what's really going on in your brain and body when sleep falls apart even though the hours add up, and how to get it back.
Dr Jemma has spent years working across stress and performance with Australian Special Forces Commandos, Olympic swimmers and McKinsey executives, and her focus has now narrowed to the one thing underneath all of it: sleep.
We explore the nightly "cleaning shift" your brain runs while you're unconscious, why alcohol and sleeping tablets rob you of the deep repair your body needs, and how missing REM sleep can quietly reshape what you're scared of.
Through powerful stories and real-life examples, we dive into:
- The glymphatic "cleaning process" that flushes toxic build-up out of your brain every night — and exactly what shuts it down
- Why caffeine doesn't actually give you energy — it just blocks the signal that you're tired
- The two-hour window before midnight where most of your growth hormone gets produced — and what you lose by missing it
- The "midnight librarian" theory of REM sleep, and its surprising link to fear conditioning and PTSD
- Why oxytocin might be the most underrated stress antidote you're not using
- The simple bedroom, morning and evening changes with the biggest impact on sleep quality
If you've ever woken up foggy after what should've been a full night's sleep, this episode explains exactly why — and what to do about it.
Connect with Dr Jemma King:
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