Sleep disorder has a known role in morbidity and mortality after kidney transplantation. Despite this, the quality of sleep and it’s association with other morbidities in kidney recipients are not fully assessed yet. The aim of this study is to evaluate these problems in a group of kidney transplanted patients.In a cross-sectional study, we employed self-administered questionnaires to evaluate the quality of sleep (PSQI), quality of life (SF-36), comorbidity (Ifudu comorbidity index), caregiver burden (CBS), anxiety and depression (HADS) and marital relationship (Marital Adjustment Scale) in a group of 125 Iranian kidney transplanted patients. Patients with PSQI score of >5 were considered as ‘poor sleeper’. T-test was used to compare the results between the two groups. Seventy-eight (62%) patients found to be 'poor sleepers’. This group showed higher total comorbidity score (p=0.009), more days using a home nurse in the past year (p=0.04), and higher bodily pain (p=0.02). ‘Poor sleeping’ was significantly associated with a poorer sexual function, poorer general mental health, and more sever depressive symptoms (p=0.05), but had not significant association with quality of life, marital status, and caregiver burden. Poor quality of sleep is common after kidney transplantation. This problem is associated with various organic and emotional morbidities such as depression, sexual dysfunction and somatic comorbidities. Therefore, more attention should be paid to evaluation of sleep quality in this patient population.