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Full Night Sleep Study (Polysomnograms)

Full Night Sleep Study (Polysomnograms)

The CGH Sleep Center is a state-of-the-art facility located in Sterling IL. We perform sleep studies six nights per week and our knowledgeable team of sleep technologists can monitor up to two patients per night. This study is usually performed during the night time, but for patients working overnight hours, they can and should have their studies performed during the daytime which is their normal sleep pattern, upon sleep physician’s request.

Overnight, attended sleep studies – known as nocturnal polysomnograms (PSG) – are conducted in a sleep laboratory where you’re monitored (or attended) all night by a trained sleep technologist. Your doctor may recommend a sleep study to diagnose or rule out a sleep disorder such as obstructive sleep apnea, narcolepsy or periodic limb movement disorder. You may also undergo a sleep study if you've already been diagnosed with a sleep disorder so that we can create or adjust your treatment plan.

During the study, we assess different sleep stages and their depth, by recording brainwaves (EEG), eye movements (EOG) and muscle tone (EMG). We also carefully examine your breathing throughout the night by measuring your airflow, breathing effort, snoring and oxygen saturation. Leg movements and heart rate (ECG) are also monitored to provide a comprehensive evaluation of your sleep.

Collecting all this data requires the sleep technologist to apply numerous sensors before you go to sleep. The set up procedure is quite complex and usually takes about 60 to 90 minutes. The hook up includes applying sensors on the scalp, face, throat, chest, finger and legs.

There are three common types of overnight sleep studies:

Diagnostic PSG:

A PSG is the initial study which is done to diagnose or rule out a sleep disorder;  this study measures your sleep and sleep events without any intervention.

Positive Airway Pressure (PAP) Titration:

A PAP titration is performed to treat the apneas found in the initial PSG. During a PAP titration, the technologist adjusts the setting on the CPAP machine to determine how much air pressure is needed to normalize your breathing.

Split Night Study:

A split night study is a combination of a diagnostic and PAP titration study. The first half is used to diagnose sleep apnea and then midway through the night PAP is started. The sleep technologist spends the rest of the night adjusting the pressure until breathing has been normalized. In order for a split night study to performed, the patient must qualify by having a minimum number of events in the first 2 hours.

To learn more about what to expect during a sleep study and how to prepare for a sleep study click here.


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