It may be something as simple as brain entrainment, but, via more systems than just visual. It would also activate sensory neurons of skin tuned for photon reception. I bet that natural sunlight was the best for all around sensory input, and thus brain entrainment. Def need to research this a bit more. I'll see if I can make some sort of box to put over my face, and then make some sort of device to flicker the sun light. I'll also make some sort of led machine to( I got a little time on my hand) and I know a lil about brain entrainment too, so I'll see what I can do( give me a couple weeks).