Ironically it's the wavelengths at sunrise which have the greatest affect. If teenagers are sleeping in they don't get to see these:
> Researchers said the wavelengths at sunrise and sunset have the biggest impact to brain centers that regulate our circadian clock and our mood and alertness.
> Researchers said the wavelengths at sunrise and sunset have the biggest impact to brain centers that regulate our circadian clock and our mood and alertness.
https://www.sciencedaily.com/releases/2020/02/200220141731.h...