The polysomnographic test

The main goal of the polysomnographic study is to identify the basic states of wakefulness, REM sleep and NREM sleep with its different phases, as shown in the figure. This is achieved through the continuous brain activity, eye activity and muscle activity monitorization. Depending on the desired information other biological body  signals may be recorded such as oral and nasal breathing, respiratory center activity, heart activity, blood oxygen levels and limb movements. The patient is visually monitored throughout the whole sleep period. Polysomnography is the definitive test to diagnose the sleep apnea syndrome and to classify its severity. It is also necessary to diagnose, among other sleep disorders, narcolepsy and other hypersomnias, nocturnal epilepsy and some sleep behavioral disorders.

 
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Origin of the word 'siesta'

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