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

Seasonal Light Links Diet And Metabolism

  • Seasonal sunlight and food availability co-evolved; summer full-spectrum light enables higher carb tolerance via mitochondrial and deuterium effects.
  • Winter favors lower-deuterium, higher-fat diets to support thermogenesis and mitochondrial efficiency.
ADVICE

Time Meals To Your Circadian Clock

  • Time meals to the day: larger breakfast within an hour of waking, moderate lunch, very small early dinner to support overnight fat-burning.
  • Eat more carbs earlier when insulin sensitivity and sunlight exposure are higher.
ADVICE

Schedule Cold And Heat Strategically

  • Prefer daytime cold plunges (after a meal) to activate mitochondria and brown fat without stimulating nighttime bio-photon activity.
  • Use sauna earlier in the evening and finish a couple hours before bed to allow core temperature to drop.
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