The normal process of polysomnography starts when the patient falls asleep and this stage is known as Non-REM. During this phase of sleep, the activity of the brain of the patient is recorded. As this phase passes, the activity of the brain gradually decreases. These brain waves are recorded by Electroencephalography (EEG). The movement of the eyes is not much during this stage as compared to the later stage. After 1 to 2 hours, the brain starts becoming active again and the patient enters the REM stage of sleep. People mostly dream during this stage. A person without any sleep disorders will shift between the Non-REM to REM phase in every 2 hours, having 4 to 6 sleep cycles each night. The sleep specialist carefully monitors the body reactions and the sleep cycles of the patient, and hence, detect any disruptions in the sleep pattern. A polysomnography test may be performed at a sleep center or in a special room in the hospital. The patient is usually asked to come in the late evening for the polysomnography test, in order to record the various sleep patterns while the patient is asleep. The entire process of polysomnography is being monitored and then analyzed by an experienced sleep specialist. Polysomnography test usually records the patient’s body shifts between 2 phases i.e. Rapid eye movement (REM) and Non-rapid eye movement (NREM).
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