In this issue of JAMA Neurology, Videnovic and colleagues1 present a study using timed light therapy in patients with Parkinson disease. They exposed patients to bright or dim-red light twice daily over a 2-week period, and then they evaluated several measures of sleep, daytime sleepiness, and symptoms of the disease. Sleep was improved, daytime sleepiness decreased, and Parkinson-specific motor scores were reduced with light therapy. Light therapy also had positive effects on activities of daily living and behavior, specifically physical activity rhythms.
Högl B. Circadian Rhythms and Chronotherapeutics—Underappreciated Approach to Improving Sleep and Wakefulness in Parkinson Disease. JAMA Neurol. 2017;74(4):387–388. doi:https://doi.org/10.1001/jamaneurol.2016.5519
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