I get that tingling in my arm and hands sometimes when I sleep on my side with my arm under the pillow or at the edge of the pillow. I wonder if it may just be the position of the arm and it may be compressing or stretching the nerve? Here's some info that discusses the related nerves, etc..

What to know about a pinched nerve in the arm: https://www.medicalnewstoday.com/articles/pinched-nerve-in-the-arm