The standard PSG includes the following channels:

1. EEG: At least two channels are recorded to determine sleep onset, sleep stages, and sleep offset.

2. Electro-oculogram (EOG): Documents both slow, rolling and REMs seen at sleep onset and in REM sleep, respectively.

3. EMG: The chin EMG is used as a criterion for REM sleep; the leg EMG is used to evaluate periodic leg movements or leg jerks.

4. ECG: Monitors heart rate and rhythm.

5. Chest impedan Monitors respiratory effort by use of cardiopneumotachographs, strain gauges, or piezoelectric crystal belts.

6. Airflow monitors: Thermistors or thermocouples are used to monitor oral and nasal airflow.

7. Capnography: Continuous monitoring of end-tidal carbon dioxide (EtCO₂).

8. Pulse oximetry: Continuous monitoring of arterial oxygen saturation (SpO₂) by noninvasive means.

9. Snoring sensor: Microphone placed just below the jaw and lateral to the trachea.

10. pH meter: pH probe placed in the lower third of the esophagus transnasally to monitor episodes of gastric reflux.

11. Audio and video recordings: Document restless sleep, sleep walking, sleep talking, and night terrors, among other conditions.

The limited PM includes the following channels:

1. ECG

2. Chest impedance

3. Airflow monitoring

4. Pulse oximetry