Effects of light therapy on sleep and anxiety in Parkinson's disease: A pilot trial.
J Affect DisordJun 9, 2026 (epub)
Yun Shen, Han-Xing Li, Jin Dai et al.
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In 30 seconds
This randomized controlled trial investigated the effects of bright light therapy (BLT) and dim light therapy (DLT) on sleep and anxiety in 33 patients with Parkinson's disease. Results indicated that BLT significantly reduced daytime sleepiness (Epworth Sleepiness Scale, P = 0.009), while DLT significantly reduced anxiety (Hamilton Anxiety Rating Scale, P = 0.030).
Key findings
- BLT significantly reduced daytime sleepiness as measured by the Epworth Sleepiness Scale (P = 0.009).
- DLT significantly reduced anxiety levels as measured by the Hamilton Anxiety Rating Scale (P = 0.030).
- BLT was associated with increased slow wave energy (P = 0.001).
- DLT was associated with increased slow wave sleep proportion (P = 0.006).
Why it matters
Understanding the differential effects of light therapy on sleep and anxiety in Parkinson's disease can inform treatment strategies, potentially improving patient quality of life. Clinicians may consider light therapy as a non-pharmacological option for managing these symptoms.