Sleep Study

A sleep study, also known as polysomnography, is a test that measures and records different body functions while you sleep. These include your: Breathing rate; Blood oxygen level; Heart rate; Brain waves; Leg movements; Eye movements; The test checks how well you are sleeping and can diagnose sleep disorders. Sleep disorders are conditions that cause problems with sleeping.

They include trouble falling asleep, getting too much sleep, and irregular breathing during sleep. Sleep disorders can affect your overall health, safety, and quality of life. Lack of sleep may increase your risk of serious conditions such as depression, diabetes, and heart disease.

Daytime sleepiness may increase your risk of an accident while driving. Early diagnosis and treatment of a sleep disorder may help you avoid health complications.

Why this test is done

You may need this test if you have symptoms of a sleep disorder, such as:

• Loud snoring during sleep
• Waking up from sleep and gasping for breath
• Trouble falling and/or staying asleep
• Daytime sleepiness

How to prepare

The preparations are the same whether you are being tested at a hospital, clinic, or your home. To prepare for your sleep study:

• Avoid alcohol and caffeine during the afternoon and evening before your test. They can disrupt your normal sleep patterns.
• Don't nap during the day. It may make it harder for you to fall asleep at night.
• Don't use lotions, hair gels, or makeup before the test. They can affect the way the electrodes work.
• Avoid using nail polish or artificial nails. The pulse oximeter is attached to your finger, and this can affect the readings.

If you normally take sleep medicines, talk to your provider about whether or not you should take the medicine before the test.

Other names for this test

polysomnography, sleep apnea study, home sleep study