Background: Somatization is a common symptom among patients with comorbid anxiety and depression. It is associated with poorer outcome, long-term evolution, worse sleep patterns and an overall lower quality of life. Previous studies suggest that sleep disturbances exacerbate somatization, which in turn negatively affects sleep. The purpose of this study was to determine the correlation between anxiety/depression and somatization/sleep quality in hospitalized psychiatric patients. Methods:Participants comprised 103 hospitalized patients with somatic symptoms disorder as major diagnosis and anxiety and depression disorders as comorbid diagnoses. All subjects were given SOMS-2 and SOMS-7 (Screening for Somatoform Symptoms) for somatization symptoms, HAM-A (Hamilton Anxiety Rating Scale) for anxiety, HAM-D 17 (Hamilton Depression Rating Scale) for depression and PSQI (Pittsburgh Sleep Quality Index) for sleep quality. The Somatic Symptom Disorder-B criteria scale (SSD-12) has been also used for the psychological impact of somatization. The same scales were administered to a control group of 77 participants by trained physicians. Results:There was a negative correlation between the scores of HAM-A/HAM-D scales and those of SSD-12. Also, positive associations between the scores of anxiety and depression scales in patients with sleep disturbances were found. Sleep scores being assessed with PSQI were significantly higher after hospitalization in 80% of participants and did not correlate with neither anxiety/depression nor somatization. In the participant group, SOMS-2 results were not correlated with any social and demographic variables. All scales scores were worse in the study group than the control group. Conclusion:Anxiety and depression symptoms may be associated with higher somatization symptoms but not with the psychological impact of somatization. Also, somatization may not directly impact sleep quality scores. Further approaches are needed to better understand the relationship between sleep quality and somatization, on one hand, and its modulation by comorbid psychiatric disorders, on the other hand.