Study of Sleep Disorders in Prodromal and Definite Parkinsons Disease

This study looks at sleep problems in people with Parkinson's disease, both in early ("prodromal") stages before a formal diagnosis and in those already diagnosed. Sleep disorders are very common in Parkinson's and may even appear years before movement symptoms. The study aims to understand sleep changes throughout the disease. **You may be eligible if...** - You are 18 or older - You have been diagnosed with Parkinson's disease according to international criteria, with a cognitive score of at least 20/30 on a standard test - Or you are at high risk of developing Parkinson's (e.g., REM sleep behavior disorder or other prodromal markers) **You may NOT be eligible if...** - You have deep brain stimulation (DBS) implanted - You have severe cognitive impairment or dementia - You are taking medications that significantly disrupt sleep in ways that would confound the study Talk to your doctor to see if this trial is right for you.