Introduction: Hypertension is a public health problem; sleep disturbances are conditions that predispose to hypertension and aggravate the quality of life of hypertensive patients. Objectives: To describe the characteristics of sleep quality in patients with hypertension in a national hospital in the city of Cusco-Peru, at 3400 meters above sea level (msnm). Material and Methods: A descriptive cross-sectional study was carried out with data of patients with hypertension who attended an outpatient consultation of the cardiology service of a national hospital in Cusco-Peru between August and December, 2017. The patients were older than 40 years without comorbidities. To characterize sleep quality, Pittsburg sleep quality index was used with prior informed consent of the patients. Results: A total of 272 hypertensive patients were studied. The average age was 65 years and the average time of the disease was 8 years. The results show that 75% of the patients had poor sleep quality and most of the patients had a sleep duration between 6 and 7 hours. All the patients presented some sleep disturbance and 94.1% did not take any medication to sleep. Conclusions: Sleep quality was poor in most of the patients studied. The follow-up of this clinical condition is necessary to evaluate the possible complications that it can cause in the long term.