Certified Polysomnographic Technician (CPSGT) Practice Exam 2026 - Free CPSGT Practice Questions and Study Guide

In a hypnogram analysis, various physiological parameters that indicate different sleep stages are recorded to provide a comprehensive understanding of a person's sleep architecture. This includes brain wave patterns, which are identified through electroencephalography (EEG). The brain wave activity showcases distinct patterns during different stages of sleep, such as rapid eye movement (REM) and non-REM sleep.

Additionally, changes in muscle tone are also monitored, typically through electromyography (EMG). These changes can indicate levels of muscle atonia that occur during REM sleep, providing insight into the body's relaxation processes associated with distinct sleep stages.

Light exposure during sleep can be considered in broader sleep studies but is not typically a direct component of hypnogram analysis. However, considering the comprehensive nature of sleep studies, light exposure's potential effect on sleep may be factored in, although it would not appear in the traditional hypnogram itself.

Therefore, the correct answer encompasses all these elements, emphasizing the importance of multiple physiological measures in understanding sleep quality and architecture, demonstrating the complexity of sleep analysis.