Different colors of light help people stay awake and to go to sleep. Sunset Sleep can assist in helping avoid sleep deprivation to combat insomnia which can make depression, sickness and mistakes more likely.
Simulating a sunsets color spectrum can increase melatonin helping people sleep and causing less disturbs the circadian rhythm.
When you go home at night and turn on the lights and TV, your body gets signals that it is daytime, if you have a regular light on next to your bed while you are reading and trying to prepare for sleep,
Based on NASA research. On some space shuttle missions up to 50% of the crew take sleeping pills, and, over all, nearly half of all medication used in orbit is intended to help astronauts sleep. NASA implemented a similar solution to help the problem.