Fig. (2) The circadian nursing care of the hospitalized patient and costs in health system. A scientific nursing practice that makes the accurate intervention to correct the disruption of the patient´s biological rhythms can reduce costs by avoiding prolonged hospitalary stays and severe complications in the patient (1). An inappropriate attention of the patient without considering biological rhythm´s synchronizing and desynchronizing factors implies the probability of raising costs in the attention of health services and inappropriate quality of attention (2).