NASA - Lighting in Outer Space - Learning Objectives
Adjusting lighting for healthy Circadian System
Russian cosmonaut Sergey Ryazanskiy, Expedition 37 flight engineer, attired in a Russian Orlan spacesuit, is pictured during a session of extravehicular activity. 2013
The Key to Better Sleep in Space? Some Nice, Colorful Light
"Red-shifted light allows sleep, and bluish light wakes you up, so the next question is whether astronauts can sleep better and then perform better with wavelength-controlled illumination. By 2016, NASA plans to install the bulbs in the real crew quarters—and its astronauts can get some well-deserved shut-eye. ..." 
At-sea trial of 24-h-based submarine watchstanding schedules with high and low correlated color temperature light sources.
"United States Navy submariners have historically lived with circadian disruption while at sea due to 18-h-based watchschedules. Previous research demonstrated that circadian entrainment improved with 24-h-based watchschedules. Twenty-nine male crew members participated in the study, which took place on an actual submarine patrol. ... "  April 2015
The sun plays an important role in our wake and sleep cycles, know as your Circadian Rhythm. Our ancestors evolved under the natural cycles of daylight and dark nights.
In artificial environments: outer space, Arctic research centers, and undersea natural light must be simulated with electric lighting. Light is energy that influences mind and body - many chemicals in our bodies are controlled by light. Melatonin is produced at night to direct our bodies to sleep. Exposure to blue tinted light can delay sleep for as much as two hours.
Circadian Response Curve, blue light will keep you awake.
Use amber night lights and street lights