[. . . ] The human body uses light cues, such as those provided by the sun, to time certain internal functions. Properly timed rhythms regulate mood, sleep, energy, appetite, and digestion. These daily internal cycles, called circadian rhythms, sometimes fall out of sync, resulting in an unregulated body clock. Unfortunately, modern living has dramatically altered nature's cues. [. . . ] While the light source is on, you can change light intensity by pushing the + or - button. If the goLITE is connected to a power outlet, then the alarm will sound and the light array will turn on when the clock reaches the alarm time. If the goLITE is operating on battery power then the alarm will sound but the lights will not turn on automatically, to conserve battery power. To turn off the alarm while it is sounding, press any button on the goLITE. Because an imbalance in circadian rhythm affects everybody differently, understanding how it affects you is critical to feeling better. Knowing what time to use the goLITE can mean the difference between responding in just a few days instead of weeks, and perhaps not responding at all. Follow these guidelines to understand how light affects your body clock and when to use the goLITE for the best results. Most people get beneficial results from fifteen to thirty minutes of usage each day. You can start using your goLITE at 50% intensity and increase the level of light if you feel like your body is not responding within a week of beginning treatment. If you find it difficult getting up each day without an alarm clock or you are sleeping in, you need morning light. If you find it difficult staying awake in the late evening and wake up too early in the morning, you need evening light. If you don't notice a shifted circadian rhythm, use the goLITE when you wake up in the morning for fifteen to thirty minutes and then again in the evening for approximately the same amount of time. This will keep your body clock from confusing the stronger morning signal with evening time. The goLITE suppresses the nighttime hormones for at least two hours, and you may not be able to fall asleep. Use the following techniques to adjust your circadian rhythm to your work shift. Many people benefit from receiving a 30-minute burst of light before work and then 15 minutes of light every three hours during work. This not only increases alertness and performance, but shifts the body clock as well. Within three days, your body clock will have changed to a night-shift schedule. Taking time-release melatonin upon arriving home after work may help accelerate the shifting of your body clock. After the second day, melatonin should not be necessary, and your body clock will have adapted to the new schedule. [. . . ] However, if you suffer from an eye disease or have a history of eye disease in your family, you should consult your ophthalmologist before using your goLITE. Also, if you are experiencing any temporary eye problems, wait until the problems are resolved before using the goLITE. When used as directed, all Apollo light products are free from ultraviolet light risk to the eye and produce a safe, diffused field of light. Apollo's lights have been tested for ocular safety and have been used in dozens of government and clinical studies. [. . . ]