Best Circadian Glasses 2026: What 560nm Really Means

“Circadian glasses” is one of the fastest-growing terms in sleep — and one of the most misunderstood. Here's what they actually do, and the one number that separates real circadian lenses from marketing.

What circadian glasses do

Your body clock is set by light hitting melanopsin-based sensors (ipRGCs) in your eyes. In the evening, that light tells your brain to stay awake and suppresses melatonin. Circadian glasses block the wavelengths responsible — so your natural night-time signal isn't interrupted.

Why 560nm is the number that matters

Melanopsin stays sensitive up to about 560nm. A real circadian lens blocks light cleanly up to that edge. Many “circadian” products only trim a little blue and leave the rest — which is why the cutoff number, and whether it's verified, matters more than the label.

How to choose

• Look for a disclosed, verified nm cutoff — not just “blocks blue light.”
• Deeper tints (red) protect more than light amber for the hours before bed.
• Choose a brand that publishes spectral data.

Sleepaxa's Circadian560 is spectrometer-verified to block 100% of light up to 560nm — the outer edge of the melatonin-suppressing range — with Red (to 550nm) and Amber options for lighter needs.

FAQ

What are circadian glasses?
Evening glasses that block the light wavelengths which suppress melatonin, helping protect your natural sleep rhythm.

Why does 560nm matter?
Melanopsin, the sensor that governs your body clock, stays sensitive up to about 560nm, so blocking cleanly to that edge gives the most complete protection.

Shop Circadian Glasses →

Educational content. Sleepaxa lenses support healthy sleep rhythms and are not a medical device.