Since narcolepsy is a chronic sleep disorder that causes overwhelming daytime drowsiness, it usually results in overwhelming drowsiness. So, a cause could be not getting enough sleep.
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<em>As Karen is preparing to present her research paper in her psychology class, she is filled will fear. She starts to sweat, and she notices that her mouth is very dry. Physiologically, Karen is experiencing the fight response that is activated by her sympathetic nervous system. </em>
