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.

[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

About Daniel

Biological Rhythms by Daniel Forger

Join us on Substack!

Join the Behavioral Grooves community

Subscribe to Behavioral Grooves on YouTube

Support Behavioral Grooves

Best of Bach

In this special Grooving session, we unpack what happens when shared facts collapse and preferred beliefs take their place. Sparked by Kurt's firsthand experience during unrest in Minneapolis, this conversation explores why people reject lived experience, how identity defense and motivated reasoning shut down dialogue, and when it’s rational to stop trying to persuade altogether. Drawing on behavioral science, persuasion research, and real-world encounters, we examine how to choose your battles, why stories succeed where arguments fail, and what it actually takes to find common ground in a belief-first world.

Dating in 2026 feels broken. The apps promise infinite choice, rom-coms on our screens promise “the one”, and yet frustration, ghosting, and mismatched expectations seem to be more normal than anything actually working out. This week, Tim Ash, author of Primal Dating, joins us as we explore why dating in the modern world feels so unstable and why many of today’s relationship struggles aren’t personal failures, but predictable outcomes of our ancient instincts clashing with modern environments and expectations.

[0:00] Introduction and Speed Round with Tim Ash

[7:52] Behavioral tendencies and evolutionary psychology

[18:09] The role of life stages in dating

[26:17] The impact of cultural norms on dating

[30:51] The economic of dating

[35:48] The role of tech in dating

[48:33] The importance of empathy in dating

[56:58] Music talk with Tim and Tim

[1:00:45] Grooving Session: Modern dating for primordial (?) minds

©2026 Behavioral Grooves

About Tim

Primal Dating by Tim Ash and Dr. Limor Gottlieb

Join us on Substack!

Join the Behavioral Grooves community

Subscribe to Behavioral Grooves on YouTube

Support Behavioral Grooves

Steely Dan - FM

Chet Baker - Almost Blue