Join Dr. Roger Seheult, a quadruple board-certified physician and co-founder of MedCram, as he explores the fascinating connection between light and health. He delves into how light exposure affects our circadian rhythms, brain function, and even mood. Dr. Seheult emphasizes the importance of natural light and outdoor time for enhancing wellbeing. He also discusses melatonin's role in longevity, the significance of sleep timing, and how certain foods may disrupt our circadian health. Discover practical tips to improve your sleep quality and overall wellness!
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insights INSIGHT
Light Sensitivity
Intrinsically photosensitive retinal ganglion cells (ipRGCs) in our eyes exhibit varying sensitivity to light throughout the day.
They are less sensitive in the morning, requiring high light intensity (100,000 lux) for activation, but highly sensitive at night, even to single photons.
volunteer_activism ADVICE
Light Exposure
Get sunlight when the sun is up, especially infrared light.
Avoid light when the sun is down to maintain healthy melatonin production.
volunteer_activism ADVICE
Morning Light
Get as much light as possible within the first 20 minutes of waking up.
Use a 10,000 lux lamp for 20 minutes if natural light is unavailable.
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On the third installment of our Longevity Series, WHOOP Global Head of Human Performance Principal Scientist, Dr. Kristen Holmes, sits down with Dr. Roger Seheult. Dr. Roger Seheult is an Associate Clinical Professor at University of California, Riverside School of Medicine and Assistant Clinical Professor at the School of Medicine and Allied Health at Loma Linda University. Dr. Seheult is a critical care physician, practicing in Beaumont, California and is a quadruple board-certified doctor of internal medicine, pulmonary disease, critical care medicine, and sleep medicine. He focuses on promoting healthy lifestyles and making medical concepts more understandable to everyone. He actively lectures at schools, hospitals, and across media outlets.
Dr. Seheult is the co-founder of MedCram, founded early in the pandemic to educate people world-wide about the spread of viruses. MedCram is now an online educational company that aims to clear up misconceptions and provide understandable medical videos for all.
Dr. Holmes and Dr. Seheult discuss the effect of light on circadian rhythm (00:42), how light and timing affects brain circuitry and mood (02:42), melatonin’s important role in longevity (05:31), why we need to be outdoors more (09:58), the importance of sleep-wake timing (14:46), slow-wave sleep and growth hormones (16:31). Dr. Seheult illustrates the foods that may be impacting your circadian health (18:42) and practical sleep changes that will help improve your sleep quality (24:25), the 8 pillars of sleep (25:15) and the importance of living for purpose (30:32).
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