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Sleep Study
A sleep study records what happens to your body while you sleep — such as breathing, oxygen and heart rate — to diagnose sleep problems like sleep apnoea.
Quick answer
Sleep Study: what it is and what the results mean
A sleep study monitors things like breathing, blood oxygen, heart rate, movements and sometimes brain activity during sleep. It may be done at home with a portable kit or in a sleep unit (polysomnography).
- Why it is done: It is used mainly to diagnose obstructive sleep apnoea and other sleep-related breathing problems, and to investigate excessive daytime sleepiness, loud snoring or unusual events during sleep.
- Understanding results: The recording shows how often breathing is interrupted and how oxygen levels change, which helps grade conditions such as sleep apnoea.
What it is
A sleep study monitors things like breathing, blood oxygen, heart rate, movements and sometimes brain activity during sleep. It may be done at home with a portable kit or in a sleep unit (polysomnography).
Why it is done
It is used mainly to diagnose obstructive sleep apnoea and other sleep-related breathing problems, and to investigate excessive daytime sleepiness, loud snoring or unusual events during sleep.
What to expect
For a home study, you attach small sensors before bed following instructions and sleep as normal, returning the kit next day. An in-unit study involves staying overnight with more sensors and monitoring.
Understanding the results
The recording shows how often breathing is interrupted and how oxygen levels change, which helps grade conditions such as sleep apnoea. A specialist interprets the results and recommends treatment if needed.
Good to know
Risks and limitations
The test is completely safe and non-invasive. Sleeping with sensors can feel unfamiliar and occasionally affects how well you sleep, but the results are usually still informative.
Education and reference only. This explains the test in general terms and is not medical advice. Always follow the specific instructions from the team arranging your test, and discuss your results with your clinician.
Answers
Sleep Study: frequently asked questions
Can a sleep study be done at home?
Yes. Many sleep studies use a portable home kit that records breathing and oxygen overnight. More detailed studies are done in a sleep unit when needed. Your clinician will advise which suits you.
What does a sleep study diagnose?
It is used mainly to diagnose obstructive sleep apnoea and related breathing problems during sleep, and to investigate excessive sleepiness, snoring or unusual night-time events.
Related tests
Other other investigations
Sources
Where this is drawn from
- NHS — Tests and treatments
- NICE — diagnostic guidance
- UK National Screening Committee / relevant professional body
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