A Study to Assess Change in Sleep Disturbances of Adult Participants With Advanced Parkinson's Disease Receiving Subcutaneous Foslevodopa/Foscarbidopa

This observational study is tracking how sleep problems change in people with advanced Parkinson's disease who are starting a new continuous under-the-skin infusion treatment called foslevodopa/foscarbidopa — a 24-hour medication delivery system to manage motor symptoms. **You may be eligible if...** - You are 18 or older with advanced Parkinson's disease - Your doctor has already decided (independently of this study) to prescribe you foslevodopa/foscarbidopa infusion as part of routine care - Your Parkinson's has severe motor fluctuations (unpredictable on/off periods) and/or involuntary movements that have not been adequately controlled by oral medications - Your cognitive score (MMSE) is 24 or higher - You have moderate-to-severe sleep problems **You may NOT be eligible if...** - You are not already being prescribed foslevodopa/foscarbidopa as part of your standard care - Your cognitive score is below 24 - You do not have significant sleep disturbances Talk to your doctor to see if this trial is right for you.