Some researchers believe that the blue part of the light spectrum, from artificial or natural light, can be activating. There are claims that blocking blue light is calming for some people. Other researchers use blue light for stimulation in some circadian rhythm disorders. Wearing glasses with amber lenses in the evening may help initiate sleep and correct a circadian rhythm problem by blocking blue light. From my Googling, I've found you need glasses with a deep amber tint. The best block mo