[Xylakant]

Shift work is absolutely normal in all kinds of industry. There’s no rule against night shifts in general, however, there are limits on work duration (normally 8hours per day/40 hours per week) and breaks between shifts - at least 11 hours of downtime. It’s also normal that night/late shifts get extra pay. So it’s only really common in places where the capital expenditures for the machines are high enough to make that worthwhile - or for example in plants that cannot easily be shut down.

24 hour stores not being a thing is a separate issue: there are laws that regulate opening hours for stores and they generally do not allow for 24/7.