Interesting. These studies seem to be looking at physical or chemical data. Is it possible that the patterns that people see with evening light are largely me

Interesting. These studies seem to be looking at physical or chemical data. Is it possible that the patterns that people see with evening light are largely mental? Until recently, most artificial light sources used in the home were in the range of 2000K. That could have developed in most people a connection between those color temperatures and sleepyness; one that would not necessarily show up in quantifiable measures like melatonin levels. Of course, that would need to be studied, and would be a more challenging study, but I think you could probably do it.