If you wear prescription glasses, you've likely been asked whether you'd like your lenses to have a blue light coating before purchase. Or, if you spend your days working on the computer or staring at ...

Add Yahoo as a preferred source to see more of our stories on Google. “Light, particularly the blue wavelength of light, is one of the strongest regulators of your circadian rhythm,” says Stephanie M.

Evening darkness — or blue-light blocking glasses — can help regulate circadian rhythms and promote steadier mood states. Did you know that darkness itself can be a mood treatment? Many people don’t ...