Light Therapy for PD – Dose Selection

This study aims to determine the most effective dose of light therapy to improve sleep in people with Parkinson’s Disease. Four groups of participants will receive bright-white or dim-red light therapy at different times throughout the day.

This is a 16-week, randomized, phase II, parallel-group, dose-selection clinical trial of LT in participants with PD and co-existing sleep disruption using a comparative selection trial design.