What physiological process does actigraphy primarily assess?

Actigraphy primarily assesses sleep-wake patterns. This non-invasive monitoring method utilizes a wrist-worn device that records movement over time, providing valuable insights into sleep duration, timing, and disruptions. By analyzing the data, clinicians can distinguish between periods of activity and rest, forming a picture of an individual's sleep habits.

This is particularly useful for diagnosing sleep disorders, evaluating the effectiveness of treatments, or monitoring sleep in various populations. While it can give insights into general activity levels throughout the day, its primary function in the context of sleep studies is to track and evaluate sleep-wake cycles, making it an essential tool for polysomnographic practice.