Connections?

Apparently it is seriously being suggested that sleeping with the curtains open can increase your risk of being obese.  A professor has said that the ostensible connection is "intriguing".  I think I will need a lot more convincing that there is any connection at all.  After all, it was only recently that someone pointed out that if you plot consumption of margarine over the past decade, and then plot the divorce rate over the same period, the two graphs are virtually identical, and yet no one would seriously suggest that eating margarine makes it more likely that you will get divorced.  So for the moment I remain to be convinced that this seeming connection between a light bedroom and obesity is any more than a weird coincidence.