This study will enroll healthy controls for the purpose of preparing for a clinical trial of neuroprotective treatments against synucleinopathies (a group of neurodegenerative diseases like Parkinson's, Lewy Body dementia, and multiple system atrophy).

The primary purpose of this study is to learn more about problems with sleep, memory, mood, and pain. This study is designed to test whether daily use of one of two devices, one to deliver light therapy and one to deliver negative ion therapy, can improve sleep, memory, mood, and/or pain.

We are looking for Veterans to study how specific amino acids affect sleep, cognition, and other outcomes.