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Falling asleep at night is so fine and happiness. Looking for mobile phone or turn on the light to look at the time at night would make you completely awaken from sweet dream, difficult to fall asleep and decline in the quality of sleep, because the strong light will stimulate your eyes. During the day it absorb the light to store energy and the light sensor show off the time. In night, the light sensor senses the dim light, time disappears, only the second hand sparkles weekly that make it easy to find, when touching the screen, time will appear. however, the light of clock is too tiny to stimulate people's eyes and sleeping.