A polysomnogram, or PSG, is a recording made during sleep that uses EEG and other physiology-related measures to evaluate sleep disorders, including excessive sleepiness during the day, difficulty falling asleep at night, and the absence of breathing during sleep ("apnea"). Patients usually spend one or two nights being observed in a lab, which resembles a normal bedroom equipped with special monitoring devices.

Before the test, electrodes are placed at strategic locations on the patient's head, face, jaw, and legs. The patient is also fitted with a small device that monitors airflow through the nose as well as a belt that gauges the rise and fall of the chest during breathing. As the patient sleeps, a technologist records various information that is later interpreted by a physician trained in sleep disorders.

The Sleep Disorders Clinic requests the following of patients to ensure that a quality polysomnography recording can be obtained:

• Ensure that your hair is clean and dry, and do not use any hair gels, dressings, or hairspray before the test. Dirty hair or scalp can interfere with electrode sensitivity.
• Do not consume beverages containing caffeine for at least 24 hours before the test.
• Do not consume alcohol at least 48 hours before the test.
• Take your regular medications, unless instructed otherwise by your doctor.
• Do not use any form of sleeping medication or sedative the night before the study.
• Wear clothing that is comfortable for sleeping.

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