If you mean professional engineer then your answer will depend on your country of origin. In the US, you do not need to have a degree. Check out the NYS PE licensure educational/experience requirements table here: Table Without a degree, it requires you to have six years of relevant, recorded, and proven experience until you are eligible to sit for the Fundamentals of Engineering examination.
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Polysomnography (PSG), a type of sleep study, is a multi-parametric test used in the study of sleep and as 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 ÏÎ¿Î»ÏÏ (polus for many, much, indicating many channels), the Latin somnus (sleep), and the Greek Î³ÏÎ¬ÏÎµÎ¹Î½ (graphein, to write).