Artificial blue light from screens and lighting in the evening suppresses the production of melatonin, a key hormone that regulates the sleep-wake cycle. By filtering these specific wavelengths, blue light blocking glasses allow melatonin to rise naturally, which can improve sleep onset, duration, and quality. Maintaining a robust circadian rhythm is foundational for cellular repair processes, hormonal regulation, and reducing the risk of numerous age-related diseases.
Verdict
A high-impact, low-cost tool for improving sleep and circadian health.
HEALTHSPAN IMPACT
High Value
RISK LEVEL
Very Low
EVIDENCE GRADE
A
MONTHLY COST
$15 - $150
Protocol
- Wear glasses that block blue and green light (amber or red lenses) for 2-3 hours before intended bedtime.
Flags
- Effectiveness depends on the specific wavelengths of light blocked by the lenses.
- Should only be worn in the evening to avoid disrupting daytime circadian signaling.
- Does not replace other critical sleep hygiene practices like maintaining a consistent sleep schedule.