Could a sleep apnea machine fix blood pressure swings in nerve disease?

This study looks at whether using a CPAP machine (a device that gently blows air through a mask) can safely lower high blood pressure when lying down at night and help reduce dizziness upon standing in people with autonomic failure. About 59 adults aged 40-80 with conditions like Parkinson's disease or multiple system atrophy will spend several days in a research center, receiving both real and sham CPAP to compare effects. The goal is to find a non-drug way to manage these blood pressure problems.