The Reason You Wake Up Tired (Even After 8 Hours) | Ep 49 with Sleep Scientist Dr. Dan Gartenberg

Most people don’t need to “optimize” their sleep — they need to understand it.In this episode of the 90% Healthy Podcast, sleep scientist Dr. Dan Gartenberg (PhD, founder of SleepSpace) breaks down why so many disciplined, high-performing people still wake up tired, and why copying sleep hacks from friends, influencers, or wearables often backfires.We cover:Why sleep advice should never be one-size-fits-allThe biggest mistakes people make with sleep trackingHow wearables help — and when they hurtWhy waking up groggy isn’t about willpowerThe science of sleep stages, smart alarms, and sleep inertiaHow light, sound, timing, and breathing shape sleep qualityWhen insomnia, sleep apnea, or anxiety is the real root causeHow to improve sleep without turning it into an obsessionDr. Dan has published 20+ peer-reviewed studies on sleep and cognition and has been featured in NPR, The New York Times, and TEDx. His work focuses on small, personalized changes that improve energy, clarity, resilience, and long-term brain health.👉 Free sleep assessment + 30-day access:https://sleepspace.com/90percentIf sleep affects your energy, mood, focus, performance, or longevity — this episode is for you.👍 Like📌 Subscribe🔁 Share with someone who’s struggling with sleepWho's the 90% Healthy Podcast for?It’s for you who wants to build a resilient body without losing your mind. If you are sick of counting every calorie, tracking too many stats, or not even wanting to start, yet are ready to stop feeling just “OK”. Klaudia and Don invite you to build resilient health that bends with real life. No rigid rules. No guilt. Just simple 1% shifts that create a strong foundation, so you can sleep like a baby, perform like a boss. and feel damn good. We cut through the noise, bring you real science (not TikTok trends), and make it easy to understand what works for the long run.Tune in wherever you listen to your podcasts.