Exposure to sunlight can have a lasting impact on overall health, according to critical care physician Dr. Roger Seheult. He ...

It would follow that sunlight, then, would be a good treatment ... it may take several weeks for light have an effect on non-seasonal depression.

These ice crystals refract and bend sunlight ... is basically a prism effect,” Berger said. “The sun shines through these ice crystals, and that bending of light produces the halo.