The aim of this study is to evaluate the effect of sleep hygiene education on sleep quality and glycemic control of Type 2 Diabetes patients. Patients between the ages of 18-65, who were registered to the Gaziemir 11 No. Dokuz Eylül Education Family Health Centers and applied to the polyclinic, and had Type 2 Diabetes diagnosis for at least 1 year were included in the study. In the patient group in which the study will be conducted, the patients who will be applied the Pittsburgh Sleep Quality Index (PSQI) and those with a PSQI score of more than 5 were included in the study. A sociodemographic questionnaire was applied to the participants, the last measured HbA1c values were questioned, and fingertip fasting blood sugars were measured. Sleep hygiene training was applied to the intervention group at the first admission, a sleep hygiene rules checklist was given and they were asked to keep a two-week sleep diary. After the two-week sleep diary, the participants in the intervention group were given training on these issues by determining the things that could impair the quality of their sleep through the sleep diary they kept. Sleep training and sleep hygiene rules checklist were given to the control group after three months of follow-up. At the end of the 3-month follow-up, PSQI was applied to both groups again, and the last measured HbA1c values were recorded and fingertip fasting blood glucose was measured.

Inclusion Criteria:

• Diagnosed with type 2 diabetes mellitus for at least 1 year
• Aged 18-65 years
• Pittsburgh Sleep Quality Index (PSQI) score > 5

Exclusion Criteria:

• Use of sedative medications
• Working night shifts
• Receiving pharmacological or non-pharmacological treatment for a diagnosed -sleep disorder
• Dementia or psychiatric disorder due to an organic or general medical condition, or history of psychotic disorder or bipolar disorder
• Pregnancy
• Change in diet or diabetes treatment regimen during the study period

Individual participant data will not be shared publicly due to ethical concerns. Data may be made available upon reasonable request, subject to approval by the ethics committee and in accordance with data protection regulations.