Electroencephalography (EEG) Topic Guide
Electroencephalography (EEG): The electroencephalogram (EEG) is a test that measures brain waves. It is used to evaluate brain disorders. The test is painless and very few risks are associated with an EEG.
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Sleeplessness and Circadian Rhythm Disorder A person's circadian rhythm is an internal biological clock that regulates a variety of biological processes according to an approximate 24-hour period. A disorder of the circadian rhythm may cause sleeplessness on at transient or chronic basis. The disorder can be caused by:
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