Objective: Sleep is important for metabolism and the immune system. Disturbed sleep may be a risk factor for poor recovery from diseases. Coronavirus disease-2019 (COVID-19) pneumonia has been the most common cause of hospitalization in the last year. This study aimed to evaluate the sleep quality of hospitalized patients with COVID-19 pneumonia and the factors that affect their sleep quality. Materials and Methods: This cross-sectional study included patients with COVID-19 pneumonia who were hospitalized at a pandemic clinic. The demographic data, symptoms, laboratory parameters, and hospitalization duration were evaluated. After the first night of admission, the patients completed Pittsburgh sleep quality index (PSQI) and hospital anxiety and depression scale (HADS). Results: This study included 105 patients, of whom 55 were with mild-moderate pneumonia and 50 with severe pneumonia. The mean value of the total PSQI score was 8.43+ or -2.03 in the non-severe group and 12.64+ or -2.24 in the severe group. Positive correlations were found between the total PSQI score and age, HAD-A score, HAD-D score, length of hospital stay, and ferritin. Negatively significant correlations were found between the PSQI score and leukocyte count, lymphocyte count, albumin, and oxygen saturation. Independent factors, such as disease severity, HADS scores, oxygen saturation, and dyspnea, were associated with the total PSQI score (R.sup.2=0.630). Conclusion: Patients who are hospitalized with COVID-19 pneumonia had poor sleep quality. Sleep quality was affected by disease severity. Anxiety and depression levels, oxygen saturation, and dyspnea are associated with sleep quality in these patients. Keywords: COVID-19 pneumonia, sleep quality, anxiety, depression, hospitalization Amac: Uyku, metabolizma ve bagisiklik sistemi icin onemlidir. Kotu uyku, hastaliklarin zayif iyilesmesi icin bir risk faktoru olabilir. Koronavirus hastaligi-2019 (COVID-19) pnomonisi son bir yilda en sik hastaneye yatis nedeni olan enfeksiyondur. Bu calismanin amaci, hastanede yatan COVID-19 pnomonili hastalarin uyku kalitesini degerlendirmek ve etkileyen faktorleri belirlemektir. Gerec ve Yontem: Calismamiz, pandemi kliniginde yatan COVID-19 pnomonili hastalari iceren kesitsel bir calismadir. Demografik veriler, semptomlar, enflamasyon belirtecleri, hastanede kalis suresi, anksiyete ve depresyon durumu degerlendirilmistir. Katilimcilara, hastaneye yatislarinin ertesi gununde Pittsburgh uyku kalitesi indeksi (PUKI) ve hastane anksiyete ve depresyon olcegi (HADS) uygulanmistir. Bulgular: Calismaya 105 gonullu hasta dahil edildi. Elli besi hafif-orta pnomonili, 50'si agir pnomonili hastalardi. Toplam PUKI puaninin ortalama degeri siddetli olmayan grupta 8,43+ or -2,03, siddetli grupta 12,64+ or -2,24 olarak saptandi. Toplam PUKI puani ile yas, HAD-A skoru, HAD-D skoru, hastanede yatis suresi ve ferritin arasinda pozitif yonde; lokosit sayisi, lenfosit sayisi, albumin ve oksijen saturasyonu arasinda negatif yonde anlamli korelasyon bulundu. Hastalik siddetinin, HADS skorlarinin, oksijen saturasyonunun ve dispnenin, toplam PUKI puanini etkiledigi saptandi (R.sup.2=0,630). Sonuc: COVID-19 pnomonisi ile hastaneye yatirilan hastalarin uyku kalitesi kotudur. Uyku kalitesi hastalik siddetinden etkilenmektedir. Bu hastalarda anksiyete ve depresyon duzeyleri, oksijen saturasyonu ve dispne uyku kalitesi ile iliskilidir. Anahtar Kelimeler: COVID-19 pnomonisi, uyku kalitesi, anksiyete, depresyon, hospitalizasyon