Summary
Ben Greenfield covers sleep optimization strategies including environment, supplements, and technology.
Key Points
- Sleep environment crucial
- Temperature affects sleep quality
- EMF reduction may help
- Strategic supplementation options
- Sleep tracking provides insights
- Consistent routines matter
Key Moments
How 3-mode circadian LED bulbs work: blue LED chip + phosphor tuning
Standard LEDs use a blue chip + yellow phosphor creating blue spikes. Circadian bulbs shift between day, twilight, and night.
"So, I mean, a standard LED bulb starts with a pure blue LED chip around like 450 nanometers. And then what they do is they coat it in a real basic yellow phosphor, and it creates white light that we see. And when you measure that within a spectrometer, it's got a very unnatural spike in blue light and very little with a yellow."
Why circadian bulbs beat blue-light glasses: whole-body coverage including skin
Blue-light glasses only protect eyes, but melanopsin receptors in skin also respond to blue light. Overhead lighting is key.
"Screens are a problem, but so is more of a problem is our overhead lighting in our home. So that's kind of why I think it's always should be a layered approach where glasses absolutely serve their purpose. If I'm on a screen at night or during the day, um I should be using them, but how do I improve the entire environment? And also, like, there is some research around looking at the receptors in our skin also activated under blue light. Melanopsin receptors have been shown to exist in the skin, which sort of are having an influence on our circadian clock as well. So there's more of an argument. Yeah, I'm glad you brought that up. A lot of people, I have an article. Yeah, I'll put a link to it in the show notes, which are at bengreenfieldlife.com/slash blue light podcasts."
Using Iris software to reduce screen blue light and flicker during the day
Iris reduces screen flicker unlike f.lux. At night, software alone isn't enough due to LED backlight bleed - add glasses too.
"It can, even though I've manipulated the color temperature, there's a bit of bleed that comes through. So, I'm still a strong proponent of if I'm on a screen at night, I'm not relying on the software, I'm relying on proper, you know, science-backed blue light glasses that are going to block all of the blue and most of the green portion up to 550 nanometers. So, I'm not having any way my melatonin at all suppressed in the evening. So, it's kind of like it's a really good."
Are blue light glasses a myth? Why the recent documentary got it wrong
A documentary debunking blue-light glasses used cheap clear-lens ones. Quality lenses blocking to 550nm do reduce melatonin loss.
"If I did a study, I bought a cheap $10 water filter and I made the conclusion that water filters don't work - it's the same with glasses."
Timing guide: match your home lighting to sunrise and sunset cycles
Use night mode before sunrise, low-blue after sunrise, red/orange at sunset. Match bulb modes to the solar cycle.
"And thanks, Ben. Enjoyed the chat. Yeah. All right, folks. Well, thanks for listening. And again, show notes are at bengreenfieldlife.com/slash blue."
