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.
Conventional indoor lighting is unhelpful when it comes to winding down for sleep; any lighting in the evening interferes with the body clock. Even low to moderate intensity light (40-250 lux) can suppress melatonin, delay sleep and make us feel more alert. The more blue the light, the stronger the effect. Studies have found a positive correlation between insomnia in older people and light levels in the evening and at night in the bedroom. In the morning, our bodies are programmed to wake gradually in response to warm dawn light. Our cognitive processes are generally fuzzy at first, but as the sun moves across the sky the cooler blue daylight helps us feel more alert. Research shows that waking up in blue-enhanced white light conditions can have a beneficial effect on cognitive processes such as short-term memory throughout the day.