What causes my arms to fall asleep at night?
Thoracic Outlet Syndrome is positional and can restrict bloodflow to your arms. It can be diagnosed with a vascular ultrasound imaging test. https://www.ninds.nih.gov/Disorders/All-Disorders/Thoracic-Outlet-Syndrome-Information-Page
You need to see a doctor and this is a fact. But in order to sleep better, you need to change the bed, recently found out that the bed affects son. I ordered a bed myself here furniture sale https://nyfurnitureoutlets.com/page/sales. Now I sleep like a baby and do not even wake up at night, although I used to wake up earlier.