Deep Brain Stimulation Neural Recordings of Varied Stimulation During Sleep in Parkinson's Disease

Participants will undergo three different nighttime-only Deep Brain Stimulation (DBS) settings in a randomized crossover design: 0% amplitude (stimulation off), 50% amplitude of their optimal clinical DBS settings, and full clinical DBS settings (100%). Each setting is applied for two weeks during sleep, over a total six-week home monitoring period. The intervention is designed to assess how varying levels of subthalamic nucleus DBS influence sleep quality and neural oscillatory activity. Only nighttime DBS settings are modified; daytime settings remain unchanged.