Determinants of Sleep Quality in Spanish Population (SSQD Study)


University of Salamanca




Sleep Quality

Study type


Funder types



GRS 2320/A/21

Details and patient eligibility


Introduction: Sleep disorders are a growing concern for public health, being related, among others, to an increased risk of cardiovascular diseases or poorer cognitive functioning. In addition, these might have a possible impact on aspects related to personal motivation and quality of life. However, few studies have analyzed the possible determinants of sleep quality in the adult population as a whole, establishing patterns based on these. Objective: To evaluate the determinants of sleep quality in a representative sample of the general adult population aged 25 to 65 years old and to establish patterns of sleep quality based on lifestyles, psychological factors, morbidities and biological markers. Methodology: Design: This is a descriptive observational, cross-sectional study that will include a representative sample of 500 people aged 25 to 65 years old from the city of Salamanca (Spain) selected by random sampling stratified by age and sex. Study variables: A visit lasting approximately 90 minutes will be carried out. The determinants of sleep quality will be assessed using both objective and self-reported methods. Variables related to life styles will be assessed: physical activity, diet and toxic habits including tobacco smoking or alcohol use. Morbidity data will also be collected, and psychological factors such as anxiety will also be assessed. Serum melatonin levels will be determined as a biological marker related to sleep quality.


500 estimated patients




25 to 65 years old


Accepts Healthy Volunteers

Inclusion criteria

  • Age 25-65 years old
  • Sign the informed consent

Exclusion criteria

  • Patients with terminal disease
  • Any clinical condition that would interfere with study procedures

Trial contacts and locations



Central trial contact

Jose Ignacio Recio Rodriguez, PhD

Data sourced from

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