To the Editor With great interest, we read the work of Videnovic and colleagues.1 They assessed the effects of timed light therapy on sleep and alertness and explored light therapy’s effects on motor and nonmotor manifestations and the quality of life for patients with Parkinson disease (PD). The results showed that bright light therapy could improve the sleep-wake cycles, enhance daytime alertness and sleep quality, and also have positive effects on activities of daily living. Although similar findings have been reported before,2 this study further emphasizes the relationship between circadian disruption and PD, and sets a new standard for future studies of sleep-wake cycles and daytime function in PD.
Li Z, Tian T. Light Therapy Promoting Dopamine Release by Stimulating Retina in Parkinson Disease. JAMA Neurol. 2017;74(10):1267–1268. doi:10.1001/jamaneurol.2017.1906
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