This randomized controlled study was designed to the effect of sleep hygiene education on sleep quality and quality of life in patients with painful diabetic polyneuropathy The study was conducted between January 2025 and January 2026 with 24 patients diagnosed with painful diabetic polyneuropathy (12 experimental, 12 control) at the Neurology clinic and outpatient clinic of a university hospital in Edirne. Data were collected using the "Patient Information Form" including sociodemographic and disease related characteristics, the Electrophysiological Severity Classification, Pittsburgh Sleep Quality Index (PSQI), Brief Pain Inventory (BPI), and SF-12 Health Survey.