Natural light exposure
Natural light exposure is essential for healthy circadian rhythms and mood.
Strong consensus“it's really teaching us how critical it is to get outdoors and exposed to light like you are right now”
Blue blockers
Blue blockers are a reliable way to support healthy circadian rhythms.
Strong consensusFor evening light exposure.
The strongest voice
“RA Optics... probably have the best technology for lenses right now... block explicitly 450 to 465 nanometers... Blue Blox... TrueDark... good options”
In their own words
One faithful sentence per source, linked to the moment it was said; quiet chips mark where money is involved.
a board-certified cardiologist recommend
“Wearing blue blocking glasses indoors helps keep melatonin levels high by blocking blue light that destroys melatonin.”
a board-certified cardiologist · source video · 00:07:50
a molecular biology PhD recommend
“Blocking blue light reduces its negative effects on blood sugar, insulin, cortisol, and melatonin levels.”
a molecular biology PhD · source video · 00:01:10
a licensed acupuncturist and clinician-educator recommend
“Wearing amber glasses before bed can increase melatonin secretion by up to 60% despite blue light exposure.”
a licensed acupuncturist and clinician-educator · source video · 00:47:00
a licensed naturopathic physician recommend
“Reducing blue light exposure at night supports melatonin production and circadian rhythm.”
a licensed naturopathic physician · Instagram reel
a licensed naturopathic physician recommend
“Reducing blue light exposure at night supports melatonin production and circadian rhythm.”
a licensed naturopathic physician · Instagram reel
a licensed naturopathic physician recommend
“Reducing blue light exposure at night supports melatonin production and circadian rhythm.”
a licensed naturopathic physician · Instagram reel
Worth discussing with your GP, especially if you take medication or are pregnant. Entrain describes what is publicly taught; it does not prescribe.
More from light and sun
Outdoor time
Spending time outdoors supports circadian rhythms, resilience, and mental well-being.
Strong consensus“when you spend extended time in the back country, say camping, like under the stars or in a tent, and we're disconnected from technology, I think it takes three three nights, three nights or four nights, and when you come back, your brain has actually reset and it's become a sponge again.”
Incandescent bulb
Incandescent bulbs are a gentle, low-blue light option for home lighting, supporting circadian health.
Strong consensus“Anywho, I buy all my incandescent bulbs from a specialist lighting shop they are the best.”