a sleep study or a polysomnography test, which is a medical test used to evaluate sleep disorders. During a sleep study, a patient spends a night in a sleep laboratory or a sleep center, where their sleep is monitored and recorded using various sensors and electrodes attached to their body. These sensors record brain waves, eye movements, muscle activity, heart rate, and other physiological functions during sleep.

A sleep study can help diagnose various sleep disorders, such as sleep apnea, insomnia, restless leg syndrome, and narcolepsy. It can also help evaluate the effectiveness of treatments for these disorders.

After the sleep study, the data is analyzed by a sleep specialist or a sleep technician, who generates a report with recommendations for treatment or further testing, if necessary. Treatment for sleep disorders may include lifestyle changes, medications, or devices such as a continuous positive airway pressure (CPAP) machine for sleep apnea .