The Revive Reading Light provides 20,000 hours of flicker-free 670nm red-light to optimize sleep quality and improve daytime mental and physical performance. The Revive reading light can be used while reading before sleep. For best results other light sources should be turned off while using Revive. Red light does not disturb the natural circadian rhythm in the ways that other light wavelengths do. Typical light includes blue wavelengths that prohibit melatonin production, the body's natural sleep inducer.