A 2023 University of Oxford study found complete darkness during sleep increased melatonin production by 28% compared to minimal light exposure. Rick has a calibrated lux meter and has measured the light leakage of every mask on this list. His lowest recorded in-mask lux reading was 0.003 — an achievement Dr. Chen documented but noted was 'not the primary variable preventing Rick from sleeping.'
Updated June 2026 · 10 products ranked










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