Welcome Back to the WHOOP Podcast's Science of Human Performance Series! This week, WHOOP Global Head of Human Performance and Principal Scientist Dr. Kristen Holmes sits down with WHOOP SVP of Research, Algorithms, and Data Emily Capodilupo for a deep dive into the science behind the WHOOP Sleep Score and the habits that have the biggest impact on restorative sleep.

Emily explains why sleep consistency is one of the strongest predictors of performance, recovery, and long-term health, and walks through the four metrics that make up your WHOOP Sleep Score: sleep duration, consistency, efficiency, and sleep stress. Together, Dr. Holmes and Emily unpack how nutrition, exercise, alcohol, stress, and your daily routines influence sleep quality, share practical strategies for falling asleep and staying asleep, and discuss how poor sleep can sometimes be an early signal of underlying health issues.

Whether you're looking to better understand your WHOOP data or simply wake up feeling more rested, this episode offers a science-backed framework for building healthier sleep habits that last.

01:11 How WHOOP Built The Sleep Algorithm

02:17 The 4 Pillars of Sleep: Duration, Consistency, Efficiency, & Stress

03:20 The Secret To You Best Night’s Sleep: Sleep Consistency

08:06 Sleep Efficiency Explained

11:38 Impact of Alcohol on Sleep Quality

18:01: How Your Day Shapes Your Night

19:34: Exclusive Offer For WHOOP Podcast Listeners

20:07: How Sleep Stress Impacts How Rested You Feel

24:08: Is Your Sleep Normal?

25:48: Why Sedatives Don’t Actually Make You Sleep Better

26:59: Defining and Combatting The 2 Types of Insomnia

28:57: Light Timing: Benefits of Red Light Therapy on Sleep