The main issue doctors are alarmed about is how the increased blue light affects circadian rhythm and not the fact that we're exposed to it. Our bodies interpre

The main issue doctors are alarmed about is how the increased blue light affects circadian rhythm and not the fact that we're exposed to it. Our bodies interpret blue light as a signal that it's daylight and we should be active. All sorts of biological processes are tied to it. Significant blue light at night screws the entire system up. Focused blue light can improve alertness and other functions. That's why light therapy has seen some significant successes in treating seasonal affective disorder, some forms of depression, and other disorders. But there's no free lunch involved here; you're more or less manipulating your circadian rhythm, and eventually, those periods of increased alertness are effectively offset. With the light therapy and SAD example, that's exactly what you want to do: you're effectively telling your body that it's daytime, you need to be active instead of sluggish, and winter is just trying to screw with you. It should help eliminate oversleeping (common with SAD), but that doesn't mean you suddenly need less sleep. The same thing would apply here as well.