Don't wear makeup, fingernail polish, or fake nails. Don't use sprays, oils, or gels on your hair. If the sleep study will be done in a sleep lab, you will be asked to shower or bathe before your test. ![]() You may be asked to avoid food or drinks with caffeine during the afternoon or evening before your test. You may be asked to stop taking certain drugs, such as sedatives, before your sleep study. Tell your doctor about any drugs you are taking. Don't take any naps on the day of your test. Try to follow your normal sleep routine during this time so you won't be too tired or too rested for your sleep test. You may be asked to keep a sleep diary before your sleep study. It helps your doctor learn what times during the day you are active and what times you are sleeping. The device measures your movement during sleep and when you are awake. For this test, you wear a device on your wrist that looks like a watch. If your doctor thinks that you may have shift work sleep disorder or another problem with your body's internal clock ( circadian rhythm), you may have a test called actigraphy. This test measures to see if you can stay awake during a time when you are normally awake. It also finds out if you enter REM sleep. This test measures how long it takes you to fall asleep. This test may record different functions than a study done in a sleep lab. This test records several body functions during sleep, such as brain activity, eye movement, oxygen and carbon dioxide blood levels, heart rate and rhythm, breathing rate and rhythm, the flow of air through your mouth and nose, snoring, body muscle movements, and chest and belly movement.Ī special type of polysomnogram can be done at home. But they also can be done with portable equipment you use at home. ![]() Sleep studies usually are done in a sleep lab. A change in this cycle may make it hard for you to sleep soundly. Normally, NREM and REM alternate through these stages about 4 to 6 times during a night's sleep. The two main types of sleep are non–rapid eye movement (NREM) and rapid eye movement (REM). Sleep studies can also find out if you have a problem with your stages of sleep. The studies are done to find out what's causing your sleep problems. Sleep studies are tests that record what happens to your body during sleep.
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