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Polysomnography or PSG is a multi-parametric test used in the study of sleep. The name is derived from Greek roots: 'Poly' (many), 'somno' (sleep), and 'graphy' (writing).

Normal patterns of human sleep were first discovered by Loomis, Harvey and Hobart in 1935. In 1952, the discovery and documentation of REM (Rapid Eye Movement) sleep was accomplished by Eugene Aserinsky, Nathaniel Kleitman and graduate students at the University of Chicago in the 1950s, it has since been codified by the adoption in 1968 of A Manual of Standardized Terminology, Techniques, and Scoring Systems for Sleep Stages of Human Subjects, edited by Allan Rechtschaffen and Anthony Kales.

Even though Aserinsky and Kleitman's discovery of REM sleep was published in 1953, no other sleep laboratory findings were published until 1959.

Polysomnography is a comprehensive recording of the biophysiological changes that occur during sleep. Polysomnography is usually performed at night during sleep. This diagnostic test monitors many body functions including brain (EEG), eye movements (EOG), muscle activity or skeletal muscle activation (EMG),heart rhythm (ECG), and breathing function or respiratory effort during sleep. In the 1970s, respiratory airflow and respiratory effort indicators were added along with peripheral pulse oximetry following the identification of the sleep disorder Sleep apnea. Polysomnography is used to diagnose many types of sleep disorders including narcolepsy, restless legs syndrome, REM behavior disorder, parasomnias, and sleep apnea.

Increasingly, polysomnography is being supplemented or replaced by Actigraphy in cases where longitudinal or large scale data sets need to be generated, or when PSG is not a cost-efficient option

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 [[Image:REM.png|thumb|Polysomnographic record of [[Rapid eye movement|REM]] Sleep . EEG highlighted by red box. Eye movements highlighted by red line.]]
-'''Polysomnography''' or '''PSG''' is the [[Parameter|multi-parametric]] test used in the study of [[sleep]]. The name is derived from [[Greek language|Greek]] roots: 'Poly' (many), 'somno' (sleep), and  'graphy' (writing).
+'''Polysomnography''' or '''PSG''' is a [[Parameter|multi-parametric]] test used in the study of [[sleep]]. The name is derived from [[Greek language|Greek]] roots: 'Poly' (many), 'somno' (sleep), and  'graphy' (writing).
-Normal patterns of human sleep were first discovered by Loomis, Harvey and Hobart in 1935. In 1952, the discovery and doccumentation of REM (Rapid Eye Movement) sleep was accomplished by Eugene Aserinsky, Nathaniel Kleitman and graduate students at the [[University of Chicago]] in the [[1950s]], it has since been codified by the adoption in [[1968]] of ''A Manual of Standardized Terminology, Techniques, and Scoring Systems for Sleep Stages of Human Subjects'', edited by Allan Rechtschaffen and Anthony Kales.
+Normal patterns of human sleep were first discovered by Loomis, Harvey and Hobart in 1935. In 1952, the discovery and documentation of [[Rapid eye movement|REM]] (Rapid Eye Movement) sleep was accomplished by [[Eugene Aserinsky]], [[Nathaniel Kleitman]] and graduate students at the [[University of Chicago]] in the [[1950s]], it has since been codified by the adoption in [[1968]] of ''A Manual of Standardized Terminology, Techniques, and Scoring Systems for Sleep Stages of Human Subjects'', edited by Allan Rechtschaffen and Anthony Kales.
-Eventhough Aserinsky and Kleitman's discovery of REM sleep was published in 1953, no other sleep laboratory findings were published until 1959.
+Even though Aserinsky and Kleitman's discovery of REM sleep was published in 1953, no other sleep laboratory findings were published until 1959.
-Polysomnography is a comprehensive recording of the biophysiological changes that occur during sleep. Ploysomnography is usually performed at night during sleep. This diagnostic test monitors many body functions including [[brain]] ([[Electroencephalography|EEG]]), [[eye]] movements (EOG), muscle activity or [[skeletal muscle]] activation ([[Electromyography|EMG]]),[[heart]] rhythm ([[Electrocardiogram|ECG]]), and breathing function or respiratory effort during sleep.
+Polysomnography is a comprehensive recording of the biophysiological changes that occur during sleep. Polysomnography is usually performed at night during sleep. This diagnostic test monitors many body functions including [[brain]] ([[Electroencephalography|EEG]]), [[eye]] movements (EOG), muscle activity or [[skeletal muscle]] activation ([[Electromyography|EMG]]),[[heart]] rhythm ([[Electrocardiogram|ECG]]), and breathing function or respiratory effort during sleep.
 In the [[1970s]], [[Respiration (physiology)|respiratory]] airflow and respiratory effort indicators were added along with peripheral pulse oximetry following the identification of the [[sleep disorder]] [[Sleep apnea]].  Polysomnography is used to diagnose many types of sleep disorders including narcolepsy, restless legs syndrome, REM behavior disorder, parasomnias, and sleep apnea.
-Increasingly Polysomnography is being supplemented or replaced by [[Actigraphy]] in cases where longitudinal or large scale data sets need to be generated, or when PSG is not a cost efficient option
+Increasingly, polysomnography is being supplemented or replaced by [[Actigraphy]] in cases where longitudinal or large scale data sets need to be generated, or when PSG is not a cost-efficient option
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 *[http://www.aset.org American Society of Electroneurodiagnostic Technologists]
 {{neuroscience-stub}}
+[[it:Polisonnografia]]