I have an insight for you that applies to everybody in the modern world. Anyone that uses a smartphone, computer, tv, modern home led and fluorescent lights. Wanna know what it is?

Circadian disruption. 

This study blows my mind every time I think about it.

http://www.newsweek.com/blue-blocking-glasses-may-help-treat-bipolar-disorder-promote-sleep-484065

These are the answer