The Sleep Is A Skill Podcast

223: Dr. Alexis Cowan, Princeton-Trained PhD, Circadian, & Metabolism Scientist: The Missing Link Between Metabolism, Light, and Deep Sleep

Aug 15, 2025
Dr. Alexis Cowan, a Princeton-trained PhD in circadian science and metabolism, shares her transformative journey from culinary school to the world of health optimization after a life-changing psychedelic experience. She reveals why blue light might be sabotaging your sleep and hormones. Alexis discusses the importance of morning sunlight, grounding, and even how cold plunges can enhance recovery. She emphasizes the need for decentralized research and shares her own sleep routine, highlighting the single change that made a significant impact.
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INSIGHT

Master Clock Is Driven By Light

  • The SCN (suprachiasmatic nucleus) is the body's master clock that syncs to light via the retina and shapes organ timing.
  • Disrupted light signals increase cellular entropy, accelerate aging, and degrade sleep and mitochondrial health.
ADVICE

Sunrise First Thing

  • Get sunrise light in your eyes soon after waking and aim for UVA rise exposure when possible to anchor circadian rhythms.
  • Use full-spectrum bright light during day and remove blue light around sunset with red bulbs or quality blue-blocking glasses.
ADVICE

Get Bright Daylight Outdoors

  • Seek bright full-spectrum outdoor light during the day; indoor rooms rarely reach sufficient lux compared to sunlight.
  • Convert daytime serotonin to melatonin at night by combining bright days with dark nights for better sleep.
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