Why our screwed-up day-night cycles might be making us sick

I'm surprised that this phenomenon is as rare as all that; I read an article semi-recently stating that many performers were "nuts" and unprofessional, and one example was of a prominent singer being difficult for technicians to work with because she'd say things like the sound needed to be more "purple." While I see why this isn't entirely professional and should be translated for the more technical (or she should have her own sound crew who knows what those nuances mean to her), neither is it New Age or psychotic--I know many people who have this, though, including myself. Sounds have shapes and colors in my head, and smells have aspects of every other sense.