Late night services at the University of Maryland Libraries have expanded over the years. McKeldin Library is now open until 8 AM Sunday through Thursday during fall and spring semesters, offering circulation, equipment loans, reserves, and tech help overnight. Staffing has increased to include 3.5 FTE staff and around 120 student hours per week. However, challenges remain such as ensuring safety, adequate supervision, effective communication, proper training, sufficient staffing, and maintenance during late hours.