Growth Minds with Sean Kim Vitamin D Expert Busts The Big Myth About Sunlight! Can It Cure Dementia?
Jan 16, 2026
Dr. Roger Seheult, a pulmonary and critical care physician and MedCram co-founder known for clear, evidence-based health explanations. He explores sunlight’s benefits beyond vitamin D, timing of light for cortisol and circadian health, how sleep timing affects physiology, sunscreen tradeoffs, and practical sauna, cold therapy, and supplementation considerations.
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Set Wake Time First, Then Bedtime
- Pick a wake time, count back 7–8 hours to set bedtime, and avoid going to bed before you're sleepy.
- Advance your schedule gradually with morning light and reduce evening light to shift circadian timing earlier.
Don't Rely On Weekend Catch-Up Sleep
- Avoid relying on weekend 'catch-up' sleep as a fix because inconsistent sleep timing disrupts circadian rhythms.
- Maintain consistent bed and wake times for better long-term health.
Use Melatonin Strategically And Sparingly
- Use immediate-release melatonin short-term to shift circadian rhythm (jet lag or schedule changes), typically 0.5–5 mg.
- Avoid high daily doses long-term and verify product quality due to variable supplements.