Why Does Jet Lag Hit so Hard? Daniel Forger

What if your mood, focus, and energy aren’t random—but driven by internal clocks you rarely think about? This week, circadian rhythm expert Daniel Forger explains why jet lag hits so hard, why sleep timing may matter more than sleep duration, and what your wearable data actually means. If you’ve ever questioned your “sleep score” or wondered whether you’re a morning person by design, this conversation will change how you understand your body’s timing system. Topics [0:00] Psychologist Off the Clock! [1:55] Intro and Speed Round with Daniel Forger [5:44] Why Crossing Time Zones Messes You Up [10:07] What Are Biological Rhythms? [13:03] Is Your Apple Watch Accurate? [22:44] How Your Biological Rhythms Impact Mood and Performance [27:17] Could Humans Adapt to a 25-Hour Day? [36:31] Circadian Rhythms and Happiness [44:39] The Three Most Important Lessons About Biological Timing [49:32] Bach, Pipe Organs, and Mathematical Patterns [53:41] Grooving Session: The Intersection of Biology and Happiness ©2026 Behavioral Grooves Links About Daniel Biological Rhythms by Daniel Forger Join us on Substack! Join the Behavioral Grooves community

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Why Does Jet Lag Hit so Hard? Daniel Forger is an episode from Behavioral Grooves Podcast by Kurt Nelson, PhD and Tim Houlihan.

This episode is 73:07 long.

This episode was published on Feb 23, 2026.

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