Beneficial blue light is so named because it’s essential in the daytime to keep us awake, alert and happy. But exposing our eyes to these blue wavelengths (approximately 460 to 490 nm) too close to bedtime suppresses melatonin, our sleep hormone, and that’s bad. When our melatonin levels fail to rise in preparation for bedtime, we have trouble falling asleep, staying asleep and reaching deep restorative sleep. Sleep disruption and deprivation have harmful consequences for our physical and mental health, ranging from obesity to diabetes to mood disorders. Our brain chemicals need to turn off as the body prepares for sleep. Read More