An article in today’s NY Times discusses circadian rhythms/body clocks and seasonal rhythms that affect our health, then ties them into cosmic changes involving lunar cycles and our bodies’ relationship to the solar system. It is a succinct expression of the principles expressed in the famous Su Wen chapters 69-77 on wu yun liu qi/five movements six qi. .

http://www.nytimes.com/2013/01/27/opinion/sunday/for-sleep-january-is-the-cruelest-month.html?_r=0