Why is the receptionist on guard?

Always stand guard, not only the all-season hotel, but also the high-end hotel like Hanting or his basic hotel, such as Home Inn, and so on. Unless it is after two o'clock in the middle of the night, I want to rest, because my sister works in a hotel. She's at the Mo Lifeng Hotel. They all belong to the same company. Basically, when you go to work, when you change shifts.

You can rest, you don't have to shift, you can stand guard.