Diagnostic overnight PSG: A PSG involves general monitoring of sleep and a variety of body functions during sleep, A sleep study measures sleep cycles and stages by recording air flow in and out of the lungs during breathing, oxygen levels in the blood, heart rhythms, eye movements, breathing effort and rate, and limb movements (picture )
Diagnostic daytime multiple sleep latency test (MSLT): The MSLT is used to diagnose narcolepsy and to measure the degree of daytime sleepiness. It measures how quickly you fall asleep in quiet situations during the day. It also monitors how quickly and how often you enter REM sleep. To ensure accurate results, it is performed on the morning following a diagnostic overnight PSG.
PSG with CPAP titration: PSG with CPAP titration is conducted when moderate or severe sleep apnea has been identified on an overnight sleep study. The test determines the necessary CPAP pressure required to alleviate apnea.
What to Expect During a Sleep Study
On the night of your sleep study, you will be assigned a private bedroom in our sleep center or hospital. Near the bedroom will be a central monitoring area, where the technicians monitor sleeping patients.
You will be hooked up to equipment that may look uncomfortable. However, most patients fall asleep with little difficulty.
Equipment Used for a Sleep Study
During the sleep study, surface electrodes will be put on your face and scalp and will send recorded electrical signals to the measuring equipment. These signals, which are generated by your brain and muscle activity, are then recorded digitally. Belts will be placed around your chest and abdomen to measure your breathing. A bandage-like oximeter probe will be put on your finger to measure the amount of oxygen in your blood.