Objective: Many patients with dementia experience sleep-related problems. However, there is a lack of clarity regarding nursing practices that can address these issues. Thus, we developed a self-assessment scale for nursing practices to improve sleep quality among patients with dementia taking sleep medication and confirmed its validity and reliability. This study aimed to test the validity and reliability of this scale for adaptability to general nurses and test its applicability.Participants and Methods: The survey included basic attributes and questionnaire items related to nursing practices to improve sleep quality in patients with dementia taking sleeping pills. Data from 477 participants with no missing values in the survey items were used in the analysis. The self-evaluation scale of nursing practices for improving sleep quality among patients with dementia taking sleeping pills was based on a three-factor model, and confirmatory factor analysis was performed using structural equation modeling.Results: Goodness-of-fit indices were satisfactory, supporting the construct validity of the scale. Cronbach’s α coefficients for the total score and the three factors of the self-evaluation scale of nursing practices for improving sleep quality among patients with dementia taking sleeping pills exceeded 0.7.Conclusion: The development of this scale can improve the quality of nursing practice for patients with dementia who take sleeping pills. Moreover, it can serve as evidence for general nurses to participate in drug treatment and can be considered as basic research for appropriate drug treatment in nursing practice.