According to law there must be one care-giver for every eight seriously retarded residents, even at night. In Elwyn, Jerusalem, for four different wards in different parts of the building there is only one night worker.
Even with all of the medications the residents are given, some are active at night. The one, solitary worker can't control what's happening. The results are violence and injuries.
Bare minimum is to follow legal guidelines. If there is a law requiring one care-giver per eight people, then there should be a hefty fine levied against any institution which doesn't comply. That way they can't claim that it's too expensive, that they don't have the budget.
If anyone knows of other situations, institutions which should have more staff, please let me know in the comments.