Shift work can disrupt the body's biological clock, especially those that need to work after midnight or overnight. When we should be asleep between midnight and early morning, but our body is forced to stay awake and continue to work, we will feel exhausted, drowsy, and even unable to concentrate. After returning home from work in the morning, our body needs to rest, but the biological clock is set to "awake" time. This impedes or delays the ability to fall asleep. It is estimated that about 10% to 20% of the global working population demands to work in shifts. According to a 2019 Asian survey, chronic insomnia affecting shift workers is nearly twice that of the general public.