What does actigraphy primarily measure in sleep studies?

Actigraphy primarily measures movement patterns. This non-invasive method involves using a wrist-worn device that tracks certain activities over time, serving as an objective indicator of sleep-wake behavior. By monitoring the amount and timing of movement, actigraphy provides valuable information about sleep duration, efficiency, and activity levels during both sleep and waking periods.

This approach is particularly useful in distinguishing between wakefulness and sleep by analyzing movement, which can help in the assessment of various sleep disorders. It is often employed in conjunction with other methods, such as polysomnography, to provide a comprehensive understanding of a patient's sleep habits and patterns.