OZET Amac: Calisma, kemoterapi alan meme kanseri olan hastalarda progresif gevseme egzersizlerinin uyku kalitesi ve agriya etkisini arastirmak amaciyla yapildi. Materyal ve Metod: Randomize kontrollu olan arastirma, Ocak 2010- Eylul 2011 tarihleri arasinda bir universite hastanesinin Onkoloji Polikliniginde yapildi. Arastirmanin orneklemini toplam 60 hasta (30 kontrol, 30 deney) olusturmustur. Verilerin toplanmasinda kisisel bilgi formu, Pittsburgh Uyku Kalitesi Indeksi (PUKI) ve “Gorsel Kiyaslama Olcegi (VAS) kullanildi. Verilerin degerlendirilmesinde yuzdelik dagilimlar ve bagimsiz gruplarda t testi kullanildi. Bulgular: Deney grubunda PUKI on test puan ortalamasi 11.70±1.87, son test puan ortalamasi 4.93±2.13 olup, gruplar arasindaki fark onemli bulunmustur (p 0.05). Sonuc: Arastirma bulgulari kemoterapi alan meme kanserli hastalarda progresif gevseme egzersizlerinin uyku kalitesini arttirmada onemli etkiye sahip oldugunu gosterirken, agri kontrolunde onemli bir etkiye sahip olmadigini gostermektedir. Anahtar Kelimeler: Gevseme egzersizleri; uyku kalitesi; agri. ABSTRACT Effects of Progressive Relaxation Training on Sleep Quality and Pain in Patients with Breast Cancer Undergoing Chemotherapy Objective: The aim of the study was to determined the effect of progressive muscle relaxation training on sleep quality and pain in women with breast cancer undergoing chemotherapy. Material and Methods: This randomized controlled study was applied between January 2010 and September 2011 in Oncology policlinic,of a University hospital. This study sampling consisted of 60 individuals (30 individuals experimental group, 30 individuals control group). A data collection form, Pittsburgh Sleep Quality Index (PSQI) and Visual Analog Skala (VAS) were used to collect the data for this study. Results: It was detected that score average of PSQI pre test in experimental group was 11.70±1.87, and that post test one was 4.93±2.13, and the distinction between the groups was significantly meaningful (p 0.05). Conclusions: The findings indicated that progressive muscle relaxation training would improve sleep quality in patients with breast cancer undergoing chemotherapy. However, relaxation exercises have not an important effect on pain control. Keywords: Relaxation exercises; sleeping quality; pain.