This is a great article about the effects of lighting on the human body clock and why human centric lighting is so important to us all. 

It's good that the effect of light on our body continues to be studied, with Apple even incorporating a low-light 'Night Shift' mode in their latest iOS update. Since the release I have been using it myself and genuinely feel that it has made a difference in the time it takes to fall a sleep after using an Apple device such as an iPhone or iPad shortly before bedtime.  With this technology having such a positive effect on our bodies you will see more companies developing even more intelligent sleep tracking apps.

I'm looking forward to more research being published shortly and seeing how Phi can be involved with human centric lighting in the future.