Which Came First Sleep Apnea, Depression Or Obesity?

Which Came First Sleep Apnea, Depression Or Obesity?
It's like the old argument: Which came first? The Chicken or the Egg?
Major new research is reporting the effect of Sleep Apnea on Depression and Obesity.
Studies are reporting that the three tend to feed off each other in a vicious, self-destructive loop.
Researching is pointing to the relationship between lack of adequate sleep and depression, which in turn causes obesity.