Blue light from light-emitting diodes elicits a dose-dependent suppression of melatonin in humans.

@article{West2011BlueLF,
  title={Blue light from light-emitting diodes elicits a dose-dependent suppression of melatonin in humans.},
  author={Kathleen E. West and Michael R. Jablonski and Benjamin Warfield and Kate S. Cecil and Mary James and Melissa A. Ayers and James Maida and Charles K. Bowen and David H Sliney and Mark D. Rollag and John P. Hanifin and George C. Brainard},
  journal={Journal of applied physiology},
  year={2011},
  volume={110 3},
  pages={
          619-26
        }
}
Light suppresses melatonin in humans, with the strongest response occurring in the short-wavelength portion of the spectrum between 446 and 477 nm that appears blue. Blue monochromatic light has also been shown to be more effective than longer-wavelength light for enhancing alertness. Disturbed circadian rhythms and sleep loss have been described as risk factors for astronauts and NASA ground control workers, as well as civilians. Such disturbances can result in impaired alertness and… 

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