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Essentials: Timing Light for Better Sleep, Energy & Mood | Dr. Samer Hattar

Huberman Lab

The Huberman Lab podcast is hosted by Andrew Huberman, Ph.D., a neuroscientist and tenured professor in the department of neurobiology, and by courtesy, psychiatry and behavioral sciences at Stanford School of Medicine. The podcast discusses neuroscience and science-based tools, including how our brain and its connections with the organs of our body control our perceptions, our behaviors, and our health, as well as existing and emerging tools for measuring and changing how our nervous system works.
Huberman has made numerous significant contributions to the fields of brain development, brain function, and neural plasticity, which is the ability of our nervous system to rewire and learn new behaviors, skills, and cognitive functioning. He is a McKnight Foundation and Pew Foundation Fellow and was awarded the Cogan Award, given to the scientist making the most significant discoveries in the study of vision, in 2017. 
Work from the Huberman Laboratory at Stanford School of Medicine has been published in top journals, including Nature, Science, and Cell, and has been featured in TIME, BBC, Scientific American, Discover, and other top media outlets.
In 2021, Dr. Huberman launched the Huberman Lab podcast. The podcast is frequently ranked in the top 10 of all podcasts globally and is often ranked #1 in the categories of Science, Education, and Health & Fitness.

In this Huberman Lab Essentials episode, my guest is Dr. Samer Hattar, PhD, the Chief of the Section on Light and Circadian Rhythms at the National Institute of Mental Health.

We discuss how light powerfully shapes mood, sleep, appetite, learning and overall mental health by aligning—or misaligning—our internal circadian clock. We explain practical protocols to support your circadian rhythm, including morning sunlight exposure, dim evening lighting and regular mealtimes. We also discuss strategies to manage jet lag, limit evening screen use, ease seasonal depression and improve focus by syncing light, sleep and food with natural biological rhythms.

Read the episode show notes at hubermanlab.com.

Thank you to our sponsors

AG1: https://drinkag1.com/huberman

Eight Sleep: https://eightsleep.com/huberman

ROKA: https://roka.com/huberman

Timestamps

(00:00) Samer Hattar

(00:27) Light, Circadian Clock vs Solar Day, Sleep-Wake Cycle

(03:20) Eyes, Photoreceptors & Light Entrainment, Blindness, Sleep

(06:13) Morning Light, Artificial Lights, Tool: Morning Sunlight Exposure

(08:28) Jet Lag Without Traveling, Sleep Issues, Screens, Staying Indoors

(09:19) Sponsors: Eight Sleep & ROKA

(12:14) Chronotypes, Intrinsic Circadian Rhythms

(14:06) Afternoon & Evening Light, Tools: Dimming Lights, Reduce Screen Use

(15:57) Light Exposure & Effects on Stress, Mood & Learning, Tripartite Model

(19:30) Light & Appetite, Tool: Regular Meal Times

(22:39) Using Light to Improve Sleep, Mood & Mental Health

(24:20) Sponsor: AG1

(25:42) Jet Lag, Tools: Temperature Minimum; Eat on Local Schedule, Avoid Mismatched Light Exposure

(29:15) Sleep Issues, Light-Dark Cycle

(30:50) Seasonality, Seasonal Depression; Daylight Savings Time

(34:07) Acknowledgements

Disclaimer & Disclosures
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