Sleep Study
Reviewed
A sleep study measures body functions while you sleep to diagnose sleep disorders. It is typically done overnight at a sleep center or at home. Electrodes record breathing, heart rate, oxygen levels, brain waves, and movements. For a home study, you attach the sensors yourself. Results include indices like AHI and oxygen desaturation. Your provider will interpret the results and recommend treatment if needed.
Preparation and collection
Avoid alcohol and caffeine in the afternoon and evening before the test. Do not nap during the day. Do not use lotions, hair gels, or makeup. Avoid nail polish or artificial nails. If you take sleep medicines, ask your provider whether to take them before the test.
Understanding this test
Use the reference interval and units printed by the laboratory that performed the test. A result outside that interval is not a diagnosis by itself, and a result inside it does not rule out every condition. Your symptoms, history, medicines, timing, and related tests can change what the result means.
- Home sleep studies use fewer sensors and are only used to diagnose obstructive sleep apnea; they are not recommended if you have other sleep disorders or health conditions that could affect breathing.
- You may not sleep as well during the study, but a full night's sleep is not necessary for results.
- In-lab studies involve a low-light video camera to record movements, which may raise privacy concerns for some individuals.
What to do next
If your results suggest a sleep disorder, your provider will discuss the findings and recommend a treatment plan. For sleep apnea, this may include lifestyle changes, a CPAP machine, dental devices, or surgery depending on your specific condition.