You’re Sleeping 8 Hours... Why Are You Still Exhausted? | Dr Jemma King

You can sleep for eight hours and still wake up exhausted. Dr Jemma King — behavioural scientist, sleep researcher and author of Sleep First — explains why the number of hours you spend in bed is only part of the story. In this conversation, Jemma breaks down what actually happens inside your brain and body while you sleep, why deep sleep is essential for restoring the brain, how REM sleep helps process fear and emotion, and why seemingly small habits can dramatically affect sleep quality. We cover: • Why 8 hours of sleep doesn't necessarily mean 8 hours of restorative sleep • What happens to your brain during deep slow-wave sleep • The “dirty brain” effect and how sleep clears metabolic waste • Why caffeine doesn't actually give you energy • How alcohol disrupts REM sleep • Why you may keep waking at 2–3AM • The importance of consistent sleep and wake times • Why going to bed earlier can matter • Morning light, cortisol and your body clock • Food, exercise and caffeine timing • The evening habits quietly destroying sleep quality • Jemma's practical routine for getting better sleep Dr Jemma King has worked across stress, performance and human behaviour with Special Forces soldiers, Olympic athletes and high-performing executives. Her book Sleep First explores why sleep is one of the foundations of mental and physical performance. If you're getting “enough” sleep but still waking up tired, this conversation may explain why. 🎙️ Podcast Credit This conversation originally appeared on the Reconnect to Self Podcast, hosted by Scott and Tracy. #Sleep #SleepScience #DrJemmaKing #SleepFirst #DeepSleep #REMSleep #Health #Performance