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Contemporary Reviews in Sleep Medicine |

Sleep and Neurodegeneration: A Critical Appraisal

Jagan A. Pillai, MBBS, PhD; James B. Leverenz, MD
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Lou Ruvo Center for Brain Health, Neurological Institute, and Department of Neurology, Cleveland Clinic, Cleveland, OH

CORRESPONDENCE TO: Jagan A Pillai, MBBS, PhD, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, 9500 Euclid Ave, U10, Cleveland, OH 44195-5243


Copyright 2017, American College of Chest Physicians. All Rights Reserved.


Chest. 2017;151(6):1375-1386. doi:10.1016/j.chest.2017.01.002
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Sleep abnormalities are clearly recognized as a distinct clinical symptom of concern in neurodegenerative disorders. Appropriate management of sleep-related symptoms has a positive impact on quality of life in patients with neurodegenerative disorders. This review provides an overview of mechanisms that are currently being considered that tie sleep with neurodegeneration. It appraises the literature regarding specific sleep changes seen in common neurodegenerative diseases, with a focus on Alzheimer disease and synucleinopathies (ie, Parkinson disease, dementia with Lewy bodies, multiple system atrophy), that have been better studied. Sleep changes may also serve as markers to identify patients in the preclinical stage of some neurodegenerative disorders. A hypothetical model is postulated founded on the conjecture that specific sleep abnormalities, when noted to increase in severity beyond that expected for age, could be a surrogate marker reflecting pathophysiological processes related to neurodegenerative disorders. This provides a clinical strategy for screening patients in the preclinical stages of neurodegenerative disorders to enable therapeutic trials to establish the efficacy of neuroprotective agents to prevent or delay the development of symptoms and functional decline. It is unclear if sleep disturbance directly impacts neurodegenerative processes or is a secondary outcome of neurodegeneration; this is an active area of research. The clinical importance of recognizing and managing sleep changes in neurodegenerative disorders is beyond doubt.

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