
Sleep studies, formally known as polysomnograms, are diagnostic tests that track and record how multiple body systems work while a person is asleep. Sleep studies are used to diagnose or rule out health issues, and they can also be used to monitor a person's response to treatment for a sleep disorder. Sleep studies are conducted at clinics or labs, and they typically take place during a person's normal sleeping hours. During a sleep study, sensors are attached to the person's head and body to record information about their brain activity, heart activity, respiratory system, eye movement, and more.
| Characteristics | Values |
|---|---|
| Test Type | Polysomnogram or Polysomnography |
| Test Purpose | Diagnostic test to track and record multiple body systems while asleep |
| Test Time | Scheduled according to individual sleep habits, preferences, and circumstances |
| Test Location | Sleep labs or at home |
| Test Conductors | Medical technicians, technologists, assistants, and nurses |
| Test Equipment | Sensors, elastic belts, oxygen-monitoring clips, CPAP machines |
| Test Results | Reviewed by a physician for signs of problems or to evaluate treatment response |
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What You'll Learn
- Sleep studies are diagnostic tests that track and record multiple body systems
- Sensors are attached to the head and body to monitor brain activity and body functions
- Sleep studies are performed at clinics or labs, but home tests are available for sleep apnea
- Sleep studies are scheduled during normal sleeping hours, and patients can bring their own pyjamas and pillow
- Sleep studies help diagnose and treat sleep disorders, including sleep apnea and restless legs syndrome

Sleep studies are diagnostic tests that track and record multiple body systems
Sleep studies are commonly used to diagnose and treat sleep disorders such as sleep apnea and restless leg syndrome. They can also evaluate certain causes of excessive sleepiness and monitor a patient's response to treatment for a previously diagnosed sleep disorder. The data collected during a sleep study provides a detailed picture of an individual's sleep patterns, including the time spent in light and deep sleep stages, oxygen levels, and the frequency of awakenings.
The preparation for a sleep study may include packing for an overnight stay and following specific bathing and grooming guidelines provided by the sleep lab. It is recommended to bathe or shower beforehand and avoid using creams, lotions, or hair care products afterward. Patients can bring their own pyjamas, toiletries, and even their pillow to the sleep lab to create a more comfortable environment.
The sleep study is conducted by a team of healthcare professionals, including medical technicians, technologists, assistants, and nurses. The technologist plays a crucial role in attaching and monitoring the sensors throughout the night, assisting the patient with any issues, and recording the test results. After the study, a physician, such as a pulmonologist or sleep medicine specialist, will review the records to identify any signs of problems and make a diagnosis.
Home sleep studies are also an option, particularly for evaluating obstructive sleep apnea (OSA). However, home studies typically involve fewer sensors and are generally recommended only when moderate to severe OSA is suspected or for follow-up testing after treatment. Overall, sleep studies provide valuable insights into an individual's sleep patterns and contribute to the diagnosis and treatment of sleep disorders.
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Sensors are attached to the head and body to monitor brain activity and body functions
Sleep studies, formally known as polysomnography or polysomnograms, are diagnostic tests that track and record how multiple body systems work while a person sleeps. Sensors are attached to the head and body to monitor brain activity and body functions. These sensors are painless and are glued or taped to the skin. The wires connecting the sensors to a computer are gathered over the head to allow the patient to move around during sleep.
Electroencephalography (EEG) sensors are coated with a sticky, electrically conductive gel that helps them stick to the head and detect brain activity. Different types of brain waves occur during different stages of sleep, and these sensors help identify sleep disorders and issues. Electrocardiography (EKG or ECG) is used to monitor the electrical activity of the heart, allowing healthcare providers to identify any issues with the heart's beating pattern and internal electrical system.
Electromyogram (EMG) sensors are attached to the skin, usually on the face and a leg, to track muscle movement. These sensors are for monitoring only and do not activate any muscles. Electro-oculography (EOG) involves placing adhesive sensors around the eyes to detect eye activity and determine when REM sleep occurs. This also helps in determining when sleep occurs, along with the EMG sensors.
In addition to these sensors, a sleep study may also include respiratory inductive plethysmography (RIP) belts to detect the expansion of the torso during breathing, and a pulse oximeter to measure pulse and blood oxygen levels. Video and audio monitoring may also be used to observe and record what happens during sleep, which can be synchronised with sensor data.
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Sleep studies are performed at clinics or labs, but home tests are available for sleep apnea
Sleep studies, formally known as polysomnograms, are diagnostic tests that track and record the activity of multiple body systems, including the heart, brain, and respiratory system, to provide healthcare providers with a comprehensive view of the quality of an individual's sleep. They are performed at sleep labs, clinics, or hospitals, and are scheduled during a person's normal sleeping hours. Sleep labs can accommodate both people who sleep overnight and those who work at night and sleep during the day.
Sleep studies involve several healthcare professionals, including medical technicians, technologists, assistants, and nurses. A technician applies small sensors to the patient's head and body to monitor brain activity and selected information from the body. Elastic belts may also be wrapped around the patient's chest and abdomen to measure breathing, and a clip may be placed on their finger or earlobe to monitor oxygen levels in the bloodstream.
Home tests are available for sleep apnea, which is a condition where an individual's breathing is interrupted during sleep due to the relaxation of throat muscles and a narrowed airway. At-home sleep apnea tests are suitable for people with suspected moderate to severe obstructive sleep apnea that isn't complicated by other disorders. These tests are more convenient and comfortable than in-lab studies, but they may have limitations. They typically involve simplified breathing monitors that track breathing, oxygen levels, and breathing effort. Sensors may be placed around the nose and mouth to detect air movement, and on the finger to measure pulse and blood oxygen levels. At-home sleep apnea tests can help specialists make a diagnosis, but they do not capture all the data of an overnight sleep study.
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Sleep studies are scheduled during normal sleeping hours, and patients can bring their own pyjamas and pillow
Sleep studies are typically scheduled during an individual's normal sleeping hours. This means that for those who sleep at night, the sleep study will be conducted overnight in a sleep lab, while those who work night shifts and sleep during the day can schedule a daytime sleep study.
Sleep studies are conducted in comfortable, hotel-like rooms, where technicians monitor brain activity and gather selected information from the body. Before the study, painless sensors are attached to the patient's head and body to record information while they sleep. Elastic belts may also be wrapped around the chest and abdomen to monitor breathing, and a clip may be placed on the finger or earlobe to measure oxygen levels in the bloodstream.
Patients can bring their own pyjamas and pillow to the sleep study, along with other personal items such as a toothbrush and toiletries. It is common to sleep less than usual during a sleep study due to the sensors and the unfamiliar environment, but this typically does not impact the test results. Patients can read and relax before bedtime and are free to move around and use the bathroom during the study.
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Sleep studies help diagnose and treat sleep disorders, including sleep apnea and restless legs syndrome
Sleep studies are a common diagnostic test that can help diagnose and treat various sleep disorders, including sleep apnea and restless legs syndrome (RLS). This test is typically conducted during a person's normal sleeping hours in a facility known as a sleep lab, which is designed to resemble a comfortable hotel room.
During a sleep study, small sensors are applied to the participant's head and body to track brain activity and gather information about various body systems, including the heart and respiratory system. These sensors help detect and record electrical brain activity, also known as brain waves, which differ during various sleep stages. Additionally, elastic belts may be wrapped around the chest and abdomen to monitor breathing patterns, and a clip may be placed on the finger or earlobe to measure oxygen levels in the blood.
For individuals suspected of having obstructive sleep apnea, a continuous positive airway pressure (CPAP) machine may be used during the latter half of the study. This machine, which includes a breathing mask, is adjusted by the technician to observe any improvements in sleep quality. Sleep studies are particularly useful in diagnosing sleep apnea, as they can determine the presence of sleep disruptions, abnormal behaviours, and excessive tiredness during the day.
In the case of RLS, a sleep study can be recommended as part of the diagnostic process, although it is not required. RLS is characterised by a strong urge to move the legs, often accompanied by uncomfortable sensations. While there is no cure for RLS, treatment can help manage symptoms and improve sleep quality. Sleep studies aid in understanding the underlying causes of RLS and developing effective treatments.
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Frequently asked questions
A sleep study, formally known as a polysomnogram, is a diagnostic test that tracks and records how multiple body systems work while you sleep. This test involves sensors that track the activity of multiple body systems, including your heart, brain and respiratory system, giving healthcare providers a comprehensive view of the quality of your sleep.
Most sleep studies take place over the course of one night, during your normal sleeping hours. You will be assigned a room to yourself and a technologist will attach sensors to your head and body to record information. The sleep study ends when you wake up in the morning and have the sensors removed.
The results of the sleep study will be sent to your doctor for interpretation. They will then contact you to discuss the findings and whether your results indicate that you have a sleep disorder.











































