Weekend Warrior

Flashing lights with no one to see them. Low pressure warnings with no one to adjust them. Dirty dishes in the canteen with no one to wash them. Tea machines flashing welcome when everyone has gone home. Rooms are in darkness, doors are all locked, security have their feet up and even the normally circling and screeching gulls are resting quietly on the roof.
Are factories sad at weekends? Are contractors working out-of-hours bringing a little joy or spoiling the peace and quiet?
Ach, a bit of both no doubt.