Submission + - Seeing Blue at Night May Not Be What's Keeping You Up After All (sciencealert.com)
None of the analyses revealed any indication that the perceived color of the light affected the duration or quality of the volunteers' sleep patterns.
Instead, all three light conditions caused a sleep delay, suggesting light in general has a more complicated impact than previously thought.
That's not to say ipRGCs aren't affected by 'blue' wavelengths of light. Rather, white light that is packed with blue waves but stimulates cone cells into seeing yellows, reds, or purples could still affect our sleep cycles.
Similarly, light that looks blue but isn't intense enough to provoke the ipRGCs into functioning might have little influence over our body's daily rhythms.
Phones of the future may one day allow us to switch into a night mode that we don't perceive in warmer tones.
"Technologically, it is possible to reduce the short-wavelength proportions even without color adjustment of the display, however this has not yet been implemented in commercial mobile phone displays," says Blume.