• (sleep study) Measurement of physiologic parameters during sleep.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• A group of tests taken during sleep to capture and record brain wave changes, eye movements, breathing rate, blood pressure, heart rate, and the electrical activity of the heart and other muscles.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• A sleep study that examines brain waves and other measures of physiological functioning.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Simultaneous and continuous monitoring of several parameters during sleep to study normal and abnormal sleep. The study includes monitoring of brain waves, to assess sleep stages, and other physiological variables such as breathing, eye movements, and blood oxygen levels which exhibit a disrupted pattern with sleep disturbances.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Nocturnal, laboratory-based polysomnography (PSG) is the most commonly used test in the diagnosis of obstructive sleep apnea syndrome (OSAS). It is often considered the criterion standard for diagnosing OSAS, determining the severity of the disease, and evaluating various other sleep disorders that can exist with or without OSAS.
  Medscape
  WebMD, 2019
• Polysomnography, also called a sleep study, is a test used to diagnose sleep disorders. Polysomnography records your brain waves, the oxygen level in your blood, heart rate and breathing, as well as eye and leg movements during the study.
  Mayo Clinic
  Mayo Foundation for Medical Education and Research