Abstract
Late-night chat reference was a service offered by University of Notre Dame reference librarians from November of 2007 until May of 2010. It was staffed by local Notre Dame librarians and was available to users from 9 p.m. until 1 a.m. Sunday through Thursday evenings during the academic year. Data showed that the number of questions asked during late-night chat hours was comparable to the number being asked during regular reference chat hours. Findings showed that the complexity of the chat questions being asked after hours was greater than that of chat questions asked during regular hours and that of reference desk transactions as a whole. Late-night chat reference was a valuable exercise in meeting users at their point of need.