4.5 Review

Longitudinal Studies of Sleep Disturbances in Parkinson's Disease

Journal

CURRENT NEUROLOGY AND NEUROSCIENCE REPORTS
Volume 22, Issue 10, Pages 635-655

Publisher

SPRINGER
DOI: 10.1007/s11910-022-01223-5

Keywords

Parkinson's disease (PD); Sleep disorders; Longitudinal studies; Rapid eye movement sleep behavior disorder (RBD); Excessive daytime sleepiness (EDS)

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Sleep disorders, such as excessive daytime sleepiness, insomnia, and rapid eye movement sleep behavior disorder (RBD), are common non-motor symptoms in Parkinson's disease (PD) which can increase over time. Further research is needed to determine if treating these sleep disorders can affect the progression of PD.
Purpose of Review Sleep disorders are among the most common non-motor symptoms in Parkinson's disease (PD). Recent longitudinal studies of sleep in PD have utilized validated sleep questionnaires and video-polysomnography performed over multiple time points. This review summarizes existing longitudinal studies focusing on the prevalence, associations, and changes of sleep disorders in PD over time, as well as the methodologies used in these studies. Recent Findings Fifty-three longitudinal studies of sleep in PD were identified: excessive daytime sleepiness, insomnia, obstructive sleep apnea, rapid eye movement sleep behavior disorder (RBD), restless legs syndrome, and shift work disorder were studied in addition to other studies that had focused on either multiple sleep disorders or broadly on sleep disorders as a whole. The prevalence of sleep disorders increases over time and are associated particularly with non-motor features of disease. RBD is now considered an established prodromal feature of PD, but other sleep disorders do not clearly increase risk of subsequent PD. Further work is necessary to determine if treatment of sleep disorders in PD alters disease symptom and their progression or reduces PD risk. Longitudinal studies of sleep in PD have demonstrated a high prevalence of sleep disorders that are associated with non-motor features of PD which can increase over time. More work is necessary to determine if treatment of sleep disorders can alter the course of PD.

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