What is the purpose of a sleep mask in polysomnography?

The purpose of a sleep mask in polysomnography primarily revolves around monitoring eye movements and assessing REM sleep. During sleep studies, particularly when evaluating sleep cycles, it is crucial to identify the different stages of sleep, including REM (Rapid Eye Movement) sleep, which is characterized by rapid eye movements, increased brain activity, and vivid dreams.

The sleep mask is equipped with sensors that can track these eye movements, allowing technologists to determine when the patient enters REM sleep and monitor patterns throughout the sleep cycle. This data is vital for diagnosing sleep disorders and understanding the patient's overall sleep architecture.

Other potential purposes for a sleep mask, such as preventing snoring, maintaining stable temperature, or improving sleep quality, may not accurately reflect the primary function of the device in the context of polysomnography.