Sleep is a physiological basic life need with phases, patterns and cycles that include periodic, returning periods of consciousness and behavioral changes. It causes circadian rhythm irregularities at various levels after surgery. Some cytokines involved in the surgical inflammatory response play a role in postoperative sleep disruption. Risk factors affecting the patient's sleep in the postoperative period; It can be discussed under three main headings: individual factors (age, gender), surgery-related factors (type of anesthesia, severity of surgical trauma, pain, anxiety), and environmental factors (being in a hospital environment, noise, light). Disrupted sleep level affects the patient's hemodynamics, ventilation, level of consciousness, and pain intensity. It is important to provide adequate sleep for the recovery of surgical patients. Therefore, the nurse should know the diagnostic methods and plan the necessary interventions.