1886 E. C. E. Lückes vi. 138 The Night Sister's object is to help the Day sister by giving the supervision to her patients and Nurses which the latter cannot exercise both night and day.
1992 L. Gordon xi. 264 His effect was like that of Night-Sister at the John Radcliffe when Olivia was born... ‘We expect things of you,’ she told the baby in bracing tones.