This randomized controlled trial evaluated the effect of a brief sleep hygiene education program on sleep quality and blood pressure in adults with essential hypertension attending a family practice center in southern Türkiye. Poor sleep quality is common in patients with hypertension and may contribute to inadequate blood pressure control and increased cardiovascular risk.

In this single-centre trial, 138 adult patients with physician-diagnosed essential hypertension were randomly assigned to an intervention group or a control group. The intervention group received a 10-15 minute face-to-face sleep hygiene education session delivered by a family physician, together with a printed brochure summarising key sleep hygiene recommendations. Participants were asked to keep a sleep diary for 8 weeks and were contacted by telephone at weeks 2, 4, and 6 to reinforce the recommendations. The control group received usual medical care for hypertension without additional education or follow-up contacts.

Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI), and office blood pressure was measured at baseline and after 8 weeks in both groups. The primary objective was to determine whether sleep hygiene education improves sleep quality; secondary objectives were to evaluate the effects of the intervention on systolic and diastolic blood pressure compared with usual care.

Hypertensive patients frequently report poor sleep quality, which may adversely affect blood pressure control and increase cardiovascular risk. Although pharmacological treatment is the cornerstone of hypertension management, simple behavioural interventions such as sleep hygiene education may provide additional benefits in primary care. This single-centre, parallel-group, randomized controlled trial was conducted in a family practice center in southern Türkiye to investigate whether a structured sleep hygiene education program could improve sleep quality and blood pressure among adults with essential hypertension.

Eligible participants were men and women aged 30-65 years with physician-diagnosed essential hypertension who were under regular follow-up at the family practice center. Patients with impaired cognitive function, alcohol or substance dependence, pregnancy, recent changes in antihypertensive medication, active infection or malignancy, or diagnosed obstructive sleep apnea were excluded. After obtaining written informed consent and completing baseline assessments, participants were randomized in blocks of four to an intervention or control group.

The intervention consisted of a 10-15 minute face-to-face education session on sleep hygiene principles (such as regular sleep-wake schedule, limiting caffeine and screen exposure before bedtime, creating a quiet and dark sleep environment) delivered by a family physician. Participants received a printed brochure summarising these recommendations and were asked to keep a daily sleep diary for 8 weeks. The family physician telephoned participants in the intervention group at weeks 2, 4, and 6 to answer questions and reinforce adherence to sleep hygiene behaviours. The control group received usual care for hypertension without additional contact related to sleep hygiene. No changes to antihypertensive medication were made as part of the study protocol.

The primary outcome was change in Pittsburgh Sleep Quality Index (PSQI) global score from baseline to 8 weeks. Secondary outcomes were changes in systolic and diastolic office blood pressure over the same period. Blood pressure was measured using an automated oscillometric device following a standardised protocol, and the mean of three readings taken after 5 minutes of rest was recorded. The study was approved by the Hatay Mustafa Kemal University Clinical Research Ethics Committee, and all participants provided written informed consent.

Inclusion Criteria:

• Adults aged 30-65 years
• Physician-diagnosed essential hypertension (office blood pressure >140/90 mmHg or on antihypertensive treatment)
• Under regular follow-up at the family practice center
• At least high school education
• Able and willing to provide written informed consent

Exclusion Criteria:

• Impaired mental capacity or cognitive impairment
• Alcohol or substance dependence
• Pregnancy
• Any change in antihypertensive medication within the previous 2 months
• Active infection or active malignancy
• Diagnosed obstructive sleep apnea

Deidentified individual participant data (IPD) for all study variables used in the analyses are publicly available in the Zenodo repository. The dataset includes anonymised sociodemographic characteristics, baseline and follow-up PSQI scores, and systolic and diastolic blood pressure measurements for all participants.

The deidentified individual participant data (IPD) and associated data dictionary have been available in the Zenodo repository since 28 July 2025 and will remain publicly accessible for an indefinite period.

Deidentified IPD and the accompanying data dictionary are openly available to any researcher. Data can be downloaded directly from the Zenodo repository without registration, prior approval, or a data use agreement.

The trial used an open-label design for participants and family physicians. However, nurses who measured blood pressure as an outcome were blinded to group assignments throughout the study.