Colin Snow
Sleep studies are diagnostic tests that monitor and record your body systems while you sleep. They are used to diagnose conditions such as sleep apnea, narcolepsy, restless leg syndrome, and sleep terrors. Sleep studies are usually conducted during a person's normal sleeping hours, but can also be done during the day for those who work night shifts. The results of a sleep study can be used to determine a treatment plan. Sleep specialists or physicians will interpret the results, which may include a patient's symptoms, clinical history, current medications, and vitals. One of the most important metrics in a sleep study result is the Apnea Hypopnea Index (AHI), which indicates the severity of sleep apnea. A low total sleep time may indicate insufficient sleep due to non-medical reasons, certain medical conditions, medications, or sleep disorders.
| Characteristics | Values |
|---|---|
| Purpose | To diagnose or rule out health issues, especially those affecting or disrupting the brain, nervous system, breathing, and heart function. |
| Test Type | Polysomnography (PSG), also known as a sleep study |
| Test Procedure | Monitoring and recording body systems while the patient sleeps. This includes the use of cameras, sensors, and medical equipment to observe sleeping patterns, breathing, and heart activity. |
| Test Results | Apneas and hypopneas are common findings. Apneas are pauses in breathing lasting at least 10 seconds, while hypopneas are shallow breaths or a 50% reduction in ventilation resulting in decreased oxygen levels. |
| Severity Measurement | Apnea Hypopnea Index (AHI) is the most important metric, indicating the average number of apnea and hypopnea events per hour of sleep. An AHI score of less than 5 is considered normal for adults. |
| Treatment | Treatment options vary depending on the severity and type of sleep apnea. |
| Sleep Latency | Total sleep time and rapid eye movement (REM) latency are crucial parameters. Short sleep latency may indicate insufficient sleep due to non-medical reasons, sleep disorders, medication effects, or physiological factors. |
| Patient Information | Reports include patient symptoms, clinical history, current medications, and vitals (height and weight). |
| Technical Details | Number of electroencephalographic (EEG), electro-oculogram, chin and leg electromyogram, electrocardiogram, and air flow measurements. |
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What You'll Learn
Sleep study design
Sleep studies are diagnostic tests that help healthcare providers diagnose or rule out health issues, particularly conditions that affect or disrupt the brain, nervous system, breathing, and heart function. Sleep studies are typically conducted in sleep labs, but home sleep tests are also becoming more common.
Sleep studies are usually scheduled during a person's normal sleeping hours, which is overnight for most people. However, those who work overnight shifts and sleep during the day can schedule daytime sleep studies. Sleep studies involve several healthcare professionals, including medical technicians, technologists, assistants, and nurses. After the study, a physician, such as a pulmonologist or sleep medicine specialist, will review the test records and discuss the results and treatment options with the patient.
Sleep study reports are typically arranged into sections containing patient information, technical details, and quantitative data regarding sleep architecture and sleep staging. The patient information section includes sleep-related symptoms, while the technical details document the number of electroencephalographic (EEG), electro-oculogram, chin and leg electromyogram, electrocardiogram, and airflow at the nose and mouth.
The total sleep time is the total amount of sleep scored during the recording, including time from sleep onset to sleep offset, and is distributed throughout the sleep time as minutes of different sleep stages: N1, N2, N3, and rapid eye movement (REM) sleep. A low total sleep time may indicate insufficient sleep due to non-medical/non-physiological reasons, certain medical or sleep disorders, or medication effects.
Another crucial parameter is rapid eye movement latency (REM latency), which is the time from sleep onset to the first epoch of REM sleep. REM sleep cycles every 90 to 120 minutes throughout the night, and changes in REM sleep latency are considered potential markers for sleep-related disorders. Therefore, knowledge of the patient's medications and sleep history is essential for interpreting sleep study results.
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Sleep architecture
The sleep stages represent the different kinds of sleep you undergo, while sleep cycles refer to the cyclical patterns of sleep that compose your sleep architecture. In the non-REM category, sleep is broken down into three stages: 1, 2, and 3. Originally, non-REM also included a stage 4 sleep category, which has since been absorbed into stage 3. Also known as N1 sleep, this early transitional stage usually (but not always) occurs after wakefulness and before full-on sleep. It is shallow sleep that shows a shift in consciousness and relaxation. When you're in stage 1 sleep, your brain issues bursts of alpha waves between stretches of relaxed brain activity. Most of us experience N1 sleep for 2 to 5 percent of total sleep time. Also known as N2 sleep, this stage of sleep is normally the most common stage of sleep. It is marked by a shift toward theta waves and other waveforms unique to N2 sleep.
Stage 3 sleep is deep sleep. During this stage, individuals are more difficult to wake from sleep and if they do wake from this stage, they typically feel drowsy. About 20-25% of sleep is comprised of deep sleep. Older individuals tend to have a lower percentage of deep sleep. REM sleep is the deepest state of sleep and is when you dream. Just as NREM 3 is when the body is restored, experts believe REM sleep is when the brain is restored and prepared for the next day.
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Sleep staging
Stage N1 is the initial stage of sleep, typically lasting a few minutes. It is a transition from wakefulness to sleep, with light sleep characterised by slow eye movements and relaxed muscles.
Stage N2 is deeper than N1, accounting for about 45% of total sleep time. Brain waves slow down, with noticeable pauses between short bursts of electrical activity, believed to be the brain organising memories and information.
Stage N3 is the deepest sleep stage, making up around 25% of adult sleep. It is characterised by slow and strong brain waves, with the body repairing injuries and boosting the immune system. N3 sleep is essential for feeling rested, and its deprivation leads to fatigue despite long sleep durations.
REM sleep is marked by rapid eye movements, temporary muscle paralysis, and heightened brain activity, often associated with vivid dreams. It is crucial for cognitive functions like memory, learning, and creativity.
The duration of each sleep stage varies with age, gender, and individual factors. For example, children need more N3 sleep, while adults exhibit reduced sleep consolidation. Men tend to spend more time in N1 sleep, while women maintain slow-wave sleep for longer.
Understanding sleep staging is essential for diagnosing and treating sleep disorders. Sleep studies help identify conditions like sleep apnea, insomnia, and periodic limb movement disorder. By evaluating sleep architecture, clinicians can tailor treatment plans to improve sleep quality and overall health.
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Sleep apnea severity
Sleep apnea is a common chronic condition that affects almost 1 billion people worldwide. It is characterised by repetitive upper airway collapse during sleep. Obstructive sleep apnea (OSA) is associated with neurocognitive impairment, hypertension, and incident cardiovascular and cerebrovascular disease.
The severity of OSA is determined by an index—the Apnea Hypopnea Index (AHI), also known as the Respiratory Disturbance Index (RDI) or the Respiratory Event Index (REI) if out-of-centre sleep testing is performed. The AHI is the average number of apnea (central, obstructive, or mixed) and hypopnea events that occur during one hour of sleep. Obstructive events occur when the body tries to breathe, but a narrowing or obstruction of the breathing passages prevents air from flowing freely. Central events occur when the brain fails to signal the breathing muscle (diaphragm) to activate, causing the person to temporarily stop breathing until they arouse and resume breathing, often at an increased rate.
The severity of OSA can vary significantly from night to night, and this variability is associated with uncontrolled hypertension. People in the highest variability quartile within each OSA severity category have a 50–70% increased likelihood of uncontrolled hypertension compared to the lowest variability quartile, regardless of OSA severity.
The classification of OSA severity based on AHI values is as follows:
- AHI <5/hour = normal (for adults)
- 5 ≤ AHI < 15/hour = mild OSA
- 15 ≤ AHI < 30/hour = moderate OSA
- AHI ≥ 30/hour = severe OSA
It is important to note that different treatment options are available depending on the severity and type of sleep apnea.
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Treatment options
Sleep studies are diagnostic tests used to identify or rule out health issues that affect sleep. They are also used to determine how to treat those conditions or to see if completed treatments worked. Sleep studies can be performed in a specialised sleep lab or at home.
- CPAP Therapy: Continuous Positive Airway Pressure (CPAP) therapy is a common treatment for sleep apnea. It involves wearing a mask that delivers pressurised air to keep the airways open during sleep. The use of a chinstrap may be recommended to prevent the jaw from falling open and causing a mouth air leak. 'Ramp time' may also be recommended, which involves a gradual increase in CPAP pressure over several minutes as the patient tries to fall asleep.
- Oral Appliances: Oral appliances, such as mouth guards or dental devices, can be used to treat sleep apnea by holding the tongue or jaw in a position that keeps the airway open during sleep.
- Surgical Intervention: In some cases, surgery may be recommended to correct structural issues that contribute to sleep apnea or other sleep disorders.
- Medication: Medication may be prescribed to help manage the symptoms of sleep disorders, such as excessive sleepiness or insomnia.
- Lifestyle Changes: Lifestyle changes, such as weight loss, changing sleep positions, or establishing a healthy sleep routine, can also be recommended to improve sleep quality and reduce the severity of sleep disorders.
- Split-night Studies: In some cases, a split-night study may be performed, where patients receive treatment on the same night as their first sleep study. This approach can save patients an additional visit to the laboratory for a treatment trial.
- Other Therapies: Depending on the specific sleep disorder, other therapies such as cognitive-behavioural therapy (CBT) or physical therapy may be recommended to address underlying psychological or physical issues contributing to the sleep disorder.
It is important to discuss the results of a sleep study and treatment options with a healthcare provider to determine the most appropriate treatment plan.
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Frequently asked questions
A sleep study is a diagnostic test that involves monitoring and recording your body systems while you sleep.
The results of a sleep study can help diagnose conditions like sleep apnea, narcolepsy, periodic limb movement disorder, certain types of seizures and epilepsy, night terrors, and nocturnal panic attacks. The results can also indicate the severity of these conditions and help determine a treatment plan.
The AHI is the most important number on your sleep study results if you are concerned about sleep apnea. It tells you the severity of your sleep apnea. An AHI score of less than 5 is considered normal for adults, and a score of 4 or lower indicates the absence of sleep apnea.
The three main types of sleep apnea are obstructive sleep apnea, central sleep apnea, and mixed sleep apnea (complex sleep apnea). Obstructive sleep apnea is caused by a physical obstruction in the airway or back of the throat and is the most common type. Central sleep apnea is rare and often seen in patients with neurological or cardiac dysfunction and opioid or alcohol use. Mixed sleep apnea is a combination of obstructive and central sleep apnea.
If you are experiencing constant fatigue, headaches, dry mouth, or shortness of breath, these could be warning signs of sleep apnea or other sleep disorders. A sleep study can help diagnose the root cause of these symptoms.
