Lookup lights out manufacturing. There are factories that often run whole days in the dark because there's no point turning on the nights if there's no one around
Not really. Although running CNC milling machines and lathes unattended at night is reasonably common. Day shift sets them up, and they cut metal all night.
Fanuc, the robot manufacturer, famously does run a lights-out factory, and has since 2001. It was the dream of Fanuc's founder. Baosteel now has a lights-out steel coiling facility. Both of these are more PR than cost effective.
There are many factories where there are very, very few people for large rooms full of machines, though.
