Shift Work - (noun)
Shift work is a regular work schedule during which an enterprise is operational or provides services beyond the normal working hours and where different groups of workers take over from each other at the same work site to perform the same operations. Shift work usually involves work in the early morning, at night or at the weekend; the weekly rest days might not coincide with the normal rest days.
Source: Taken/Adapted from EurWork
Example of Use: Laila works shift work. This week she is on the night shift, but next week she’ll be working the early-morning shift.