JLPT N3 Reading

A library has begun opening its building after closing time as a 'night study room'. It's for high-school and university students, usable until 10 p.m. The trigger was staff noticing that before exams many students studied at a nearby fast-food restaurant. It's awkward to stay long in a restaurant, and it costs money. The library is quiet and free, but closed too early. Since opening, users have exceeded expectations. However, night-time supervision needs staff, and whether it can continue is the next challenge. Q: What challenge is mentioned? — The staff needed for night-time supervision.