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

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

Huberman Lab

2025/08/21
Huberman Lab

Huberman Lab

2025/08/21
OverviewShownoteHighlightsTranscriptChaptersPins

Shownote

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 Learn more about your ad choices. Visit megaphone.fm/adchoices

Highlights

In this episode of the Huberman Lab Essentials, Dr. Andrew Huberman welcomes Dr. Samer Hattar, an expert in light and circadian rhythms, to explore how light exposure influences our brain function, sleep, mood, and overall health. The conversation delves into the biological mechanisms behind our internal clock and how modern behaviors can either support or disrupt this natural rhythm.
00:28
Light affects mood, hunger, and survival through circadian regulation.
08:32
Excessive phone use and lack of sunlight disrupt circadian rhythms.
12:20
Morning sunlight helps determine ideal chronotype
14:12
Disrupted light exposure can affect stress, learning, and memory.
16:16
Even with good circadian and homeostatic drives, wrong-timed light exposure or stress can disrupt sleep
19:33
Proper light exposure and regular meal times help regulate eating behavior.
22:50
LED lights can regulate light spectra and intensities to improve mood and mental health
24:22
AG1 now comes in three new flavors: berry, citrus, and tropical.
25:42
Eating on the local schedule can help shift the circadian clock
29:17
Aligning circadian rhythms with light-dark cycles can improve sleep quality
30:51
Daylight Savings Time disrupts the circadian clock, mood, and sleep.
34:07
Andrew asks Samer about his social media handles for continued discussions on chronobiology and light.

Chapters

Samer Hattar
00:00
Light, Circadian Clock vs Solar Day, Sleep-Wake Cycle
00:27
Eyes, Photoreceptors & Light Entrainment, Blindness, Sleep
03:20
Morning Light, Artificial Lights, Tool: Morning Sunlight Exposure
06:13
Jet Lag Without Traveling, Sleep Issues, Screens, Staying Indoors
08:28
Sponsors: Eight Sleep & ROKA
09:19
Chronotypes, Intrinsic Circadian Rhythms
12:14
Afternoon & Evening Light, Tools: Dimming Lights, Reduce Screen Use
14:06
Light Exposure & Effects on Stress, Mood & Learning, Tripartite Model
15:57
Light & Appetite, Tool: Regular Meal Times
19:30
Using Light to Improve Sleep, Mood & Mental Health
22:39
Sponsor: AG1
24:20
Jet Lag, Tools: Temperature Minimum; Eat on Local Schedule, Avoid Mismatched Light Exposure
25:42
Sleep Issues, Light-Dark Cycle
29:15
Seasonality, Seasonal Depression; Daylight Savings Time
30:50
Acknowledgements
34:07

Transcript

Speaker 3: Welcome to Huberman Lab Essentials, where we revisit past episodes for the most potent and actionable science-based tools for mental health, physical health, and performance. I'm Andrew Huberman, and I'm a professor of neurobiology and ophthalmo...