sleep-masks
Manta Sleep Mask
The Manta Sleep Mask is the gold standard for circadian optimization due to its guaranteed 100% blackout capability and modular design. By eliminating all light leaks, it prevents the suppression of melatonin, even in bright environments.
Quality & Materials
Constructed with OEKO-TEX certified fabrics; the eye cups are made of breathable modal and the strap is a snag-free industrial-grade hook and loop.
Evidence & Testing
While masks themselves aren't drugs, the physiological impact of 100% darkness on the pineal gland's melatonin production is well-documented in circadian biology.
Brand Transparency
Manta provides detailed material breakdowns and clear manufacturing origins, maintaining high standards for textile safety.
Value Assessment
At $35, it is priced mid-range but offers significantly higher durability and customization than budget silk masks.
Why Not Alternatives?
Unlike flat masks (like Slip or Alaska Bear), Manta uses adjustable eye cups that create a true seal around the eyes without applying pressure to the eyelids, preventing the 'blurred vision' effect and ensuring total darkness for all face shapes.
Sources & References
More in Circadian & Light
Ra Optics
Sunset Lenses (Clyde Frame)
Ra Optics is the industry leader in precision optics for circadian health, utilizing proprietary pigments that provide a sharp 550nm cutoff. Unlike most competitors, they use high-quality CR-39 plastic lenses which offer superior optical clarity compared to cheap polycarbonate.
Bon Charge
Sleep Blue Light Blocking Glasses
Bon Charge (formerly BluBlox) offers laboratory-tested lenses that block 100% of the blue and green light spectrum from 400nm to 550nm. Their frames are exceptionally high quality, and they offer prescription, reading, and non-prescription options.
BlockBlueLight
NightLens Blue Light Blocking Glasses
BlockBlueLight offers the best balance of clinical-grade spectrum accuracy and affordability. Their NightLens is specifically designed to block 100% of blue and green light up to 550nm, backed by accessible spectral analysis reports.
Swanwick
Classic Night Swannies
Swanwick is the brand that popularized blue blockers for sleep. Their orange 'Swannies' are effective at blocking blue light and are a reliable, well-reviewed entry point for those new to circadian optimization.