Consistent Sleep Patterns to Prevent Depression

 There Could Be a Dramatic Hidden Impact of Not Having a Regular Bedtime, Study Shows (sciencealert.com)

The result doesn't surprise me because much earlier studies made it obvious that maintaining regular sleep patterns is important for health. Our sleep cycle is regulated by our circadian rhythms. That is about much more than sleep because our circadian rhythms have body wide implications for metabolism. 

Interesting speech on the Genetics of Modern Europeans and Indians

 David Reich, "A Tale of Two Subcontinents: The Parallel Prehistories of Europe and South Asia"