True blackout window coverage can reduce ambient bedroom light to below 0.1 lux — a level at which circadian rhythm research confirms melatonin onset accelerates by up to 22 minutes. Rick has measured every set of curtains on this list with a calibrated lux meter at 2 AM. The best performer reached 0.04 lux. Dr. Chen called this 'an admirable measurement' and asked whether Rick had slept. Rick reported the data was very promising.
Updated June 2026 · 10 products ranked










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Rick's current protocol, updated monthly. Tonight might be different.