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Sleep Disorders 

Sleep Disorders
Chapter:
Sleep Disorders
Source:
Introduction to Clinical Neurology (5 ed.)
Author(s):

Douglas J. Gelb

DOI:
10.1093/med/9780190467197.003.0009

Sleep consists of a highly patterned sequence of cyclic activity in various regions of the brain; it is not simply a state of temporary unconsciousness. Although the brain is less responsive than normal during sleep, it is not totally unresponsive. In fact, during sleep the brain responds more readily to meaningful stimuli. Rapid eye movement (REM) sleep can be characterized as a period when the brain is active and the body is paralyzed, whereas in nonrapid eye movement (NREM) sleep, the brain is less active but the body can move. Sleep disorders are grouped into three general categories, based on whether patients have trouble staying awake, trouble sleeping, or abnormal behaviors during sleep.

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