New research indicates that nighttime light may affect us in more nuanced ways that previously thought. Blume lead a research team from the University of Basel that reported that “Ambient light however does not only allow us to see, it also influences our sleep-wake rhythm. . . . . If light consists solely of short wavelengths of 440 to 490 nanometres, we perceive it as blue. If short-wavelength light activates the ganglion cells, they signal to the internal clock that it is daytime. The decisive factor here is how intense the light is per wavelength; the perceived color is not relevant.” This study is published in Nature Human Behaviour.
“Light Color is Less Important for the Internal Clock Than Originally Thought.” 2023. Press release, University of Basel, https://www.eurekalert.org/news-releases/1029731