Is blue light actually harmful to your sleep? Why the science isn’t so clear on this popular belief

For anyone who cares about their so-called “sleep hygiene” — essentially good, deep, restful sleep — it has become conventional wisdom that blue light will wreck it. Blue light is often the wavelength of light produced by electronic devices like televisions, smart phones and computers. You know, the obsidian slabs we stare into at all hours of the day, even long after the sun has set....

Originally posted on salon.com