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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").
Often a formal sleep study has been performed the night before. Sometimes urine screening is done to make sure no substances exist in the subject's body that might interfere with sleep. The patient may be asked to fill out a pre-test questionnaire. Electrodes are attached to the patient's head to record brain waves.
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.
The information includes sleep onset time, sleep latency, number of awakenings in a night, time in bed, daytime napping, sleep quality assessment, use of hypnotic agents, use of alcohol and cigarettes, and unusual events which may influence a person's sleep. Such a log is usually made for one or two weeks before visiting a somnologist.
Notte prima degli esami (English: Night Before the Exams) is a 2006 Italian comedy teen film, written and directed by Fausto Brizzi. It describes the lives of two groups of Italian teenagers during the preparation of the esame di maturità (the final exam of Italian high school). It is set in Rome during the year 1989.
They found that students tend to sleep less than usual the night before an exam and that exam performance was positively correlated with sleep duration. [143] A study performed by the Department of Psychology at the National Chung Cheng University in Taiwan concluded that freshmen received the least amount of sleep during the week. [144]