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“Time to sleep” is a light that reminds people to go to bed on time. The busy city life, enormous study and work pressure often make people work late into the night and even forget the sleeping time, thus neglecting the importance of sleep. "Time to sleep" will slowly dim its own lights over time, and will gradually appear “black rim of eye” like a panda's eyes, which also suggests that people who stay up late for a long time will have "black rim of eye." The panda also close its eyes slowly as it feels sleepy. If panda wants to rest, people should pay more attention to their bodies and sleep on time.