This paper seeks to identify tasks performed out of hours by pre-registration house officers and to determine whether they could be performed by someone other than a doctor. It was conducted in two parts: a descriptive study in four hospitals using diaries and interviews and a consensus panel consisting of four consultants, three junior doctors, and two nurses. The panel agreed that one-third of the tasks performed by house officers at night could be done by someone other than a doctor. The work-load of house officers could be reduced considerably by providing additional clerical and administrative support and a more widespread adoption of an extended role for nurses. However, the greater professional independence of nurses which may result might require doctors to redefine some of their roles.