Study Summary: We are studying how sleep helps people with neurodegenerative diseases, which are illnesses where harmful proteins build up in the brain. We want to see if changing sleep with sounds (auditory stimulation) can help. We will compare people with these diseases to healthy people.

Key Terms: Neurodegenerative diseases are conditions where brain cells degenerate or die, causing problems with movement or thinking. Protein aggregation means proteins that clump together, which can harm the brain. EEG (Electroencephalogram) is a test that checks brain activity using small sensors on your head.

• **Study Duration: ** The study will involve multiple visits for assessments and use of an ambulant EEG device.
• **Participation Requirements: ** Participants must be over 18, healthy or diagnosed with a specific neurodegenerative disease, and able to use the EEG device.
• **Risks & Exclusions: ** Those with hearing issues, skin problems, or certain medication use might not qualify. Informed consent is required.