The night work (11 pm-7 am) in primary care in one health district (population 195 212 with 93 general practitioners) was studied over a three month period, starting 1 January 1983. The workload proved to be small (15% of all "out of hours" work for general practitioners). An average of three night visits was done a night in the whole health district, and 26 general practitioners were available for these. On average, over seven doctors were available each night for each patient who required a visit in primary care in the health district. It is concluded that there is only sufficient work for (at maximum) two doctors, and a system is proposed to make more efficient use of the general practitioner's time.