Life Hacks for Health

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See here: http://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
You can buy lights that control the output spectrum. Not too many products seem to be available yet (as of june 2016). GE sells a light for night, and a light for morning separately, most surely so they can sell one that does it all later, and make more money along the way.
http://www.usailighting.com/circadian-rhythm-lighting
https://www.kickstarter.com/projects/364176964/silk-by-saffron-smart-led-lighting-bring-sunlight

“ Light is so powerful at effecting melatonin that even a dime-sized fiber optic light on the back of your knee in an otherwise pitch black room has been shown to decreases natural melatonin production and even increase increases cortisol production. ” based on a study in 1998, that was later debunked:
https://www.ncbi.nlm.nih.gov/pubmed/11094143
http://www.genomenewsnetwork.org/articles/08_02/bright_knees.shtml
http://www.sciencemag.org/news/2002/07/knee-clock-connection-disputed