Ep. 17: How to Fix Your Sleep Part 1: Circadian Rhythm and Light — Key Takeaways
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Ep. 17: How to Fix Your Sleep Part 1: Circadian Rhythm and Light
Jay Feldman Wellness1h 5mJul 20, 2020
Watch the originalGet sunlight exposure within minutes of waking, wear blue-light-blocking glasses after sunset, and replace fluorescent/bright-white LED bulbs with incandescent or halogen to protect melatonin production and improve sleep quality.
Key takeaways
Blue light blocks melatonin via melanopsin receptors; red light does not — use both strategically
Blue light blocks melatonin via melanopsin receptors; red light does not — use both strategically
- Blue-spectrum light hits melanopsin receptors in the eye and directly inhibits melatonin synthesis; removing it at night restores the natural sleep-onset signal.
- Red light increases mitochondrial respiration via cytochrome C oxidase without suppressing melatonin, making it safe for evening use.
Consistent wake time — not bedtime — is the primary lever for resetting a disrupted sleep schedule
Consistent wake time — not bedtime — is the primary lever for resetting a disrupted sleep schedule
- Clinical shift-work rehab programs fix sleep schedules by enforcing a fixed wake time regardless of how little sleep was obtained — no snoozing, no naps.
- Sleeping in to compensate for a late night pushes the next night's sleep onset later, creating a compounding delay cycle.
Screen dimming via PWM flicker is a hidden stressor — use Iris software to dim by reducing emission instead
Screen dimming via PWM flicker is a hidden stressor — use Iris software to dim by reducing emission instead
- Most screens dim by flickering on/off faster than conscious perception; this still stresses the visual system and can cause headaches.
- Iris software reduces brightness by lowering light emission strength, eliminating flicker stress while also allowing direct blue-light reduction.
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In this video
- 1mintro
- 2mthe importance of sleep and making sleep a priority
- 15mthe relationship between sleep, circadian rhythm, and metabolism
- 25mimproving sleep with proper sleep timing and light exposure
- 43mthe types of light and the relationship between light and sleep
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