Polysomnography is used to diagnose many types of sleep disorders including sleep apnea, periodic limb movement disorder,REM sleep behavior disorder, parasomnias, and narcolepsy. It is a comprehensive recording of the biophysiological changesthat occur during sleep. The polysomnography monitors many body functions parameters including EEG, EOG, EMG, ECG,respiratory airflow, respiratory effort, and pulse oximetry during sleep. Multiple Sleep Latency Test (MSLT) is performed fordiagnosing narcolepsy and excessive daytime sleepiness. It is usually to be done after an overnight polysomnography. Thetest consists of four or five 20-minute nap opportunities that are scheduled two hours apart.
