**Core Concept**
Polysomnography (PSG) is a comprehensive sleep study that records various physiological activities during sleep, including brain waves, muscle activity, heart rate, and breathing patterns. It is a crucial diagnostic tool for sleep disorders such as sleep apnea, insomnia, and restless leg syndrome.

**Why the Correct Answer is Right**
Polysomnography typically includes electroencephalography (EEG), electromyography (EMG), electrooculography (EOG), and electrocardiography (ECG). These tests provide valuable information about the different stages of sleep and help identify sleep disorders. The correct answer will be a test that is not typically included in a standard PSG.

**Why Each Wrong Option is Incorrect**
**Option A:** Not applicable (no information provided).
**Option B:** Not applicable (no information provided).
**Option C:** Not applicable (no information provided).
**Option D:** Not applicable (no information provided).

**Clinical Pearl / High-Yield Fact**
A standard PSG typically includes EEG, EMG, EOG, and ECG, but may also include additional tests such as pulse oximetry and nasal pressure monitoring.

**Correct Answer:** A, B, C.