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Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
Sign with text: Sömnförsök pågår (Sleep study in progress), room for sleep studies in NÄL hospital, Sweden. A sleep study is a test that records the activity of the body during sleep. There are five main types of sleep studies that use different methods to test for different sleep characteristics and disorders.
Pediatric polysomnography patient, Children's Hospital (Saint Louis), 2006. Somnology is the scientific study of sleep. It includes clinical study and treatment of sleep disorders and irregularities. Sleep medicine is a subset of somnology. Hypnology has a similar meaning but includes hypnotic phenomena. [1]
One classic cultural example of a biphasic sleep pattern is the practice of siesta, which is a nap taken in the early afternoon, often after the midday meal. [6] Such a period of sleep is a common tradition in some countries, particularly those where the weather is warm. The siesta is historically common throughout the Mediterranean and ...
Polysomnography often includes electroencephalography, electromyography, electrocardiography, muscle activity and respiratory function. [ 35 ] [ 36 ] Polysomnography is helpful to identify the very short sleep onset latency period, the very efficient sleep (more than 90%), the increased slow wave sleep, and sometimes an elevated amount of sleep ...
Example hypnogram of a normal, healthy adult Here, both stage 3 and stage 4 are shown; these are often combined as stage 3. A hypnogram is a form of polysomnography; it is a graph that represents the stages of sleep as a function of time.
Polysomnography, the "gold standard" method for sleep tracking that requires attaching electrodes and monitors to the patient as they sleep, was developed in the late 1950s. [ 5 ] [ 6 ] [ 7 ] It is considered by sleep researchers as providing the most accurate sleep data, however, it is an expensive, often uncomfortable experience for patients ...
Sickle-cell anaemia is found mostly in tropical populations in Africa and India.An individual homozygous for the recessive sickle hemoglobin, HgbS, has a short expectancy of life, whereas the life expectancy of the standard hemoglobin (HgbA) homozygote as well as heterozygote is normal (though heterozygote individuals will suffer periodic problems).