[Theory5]

What do you mean the ulnar "side"? The ulnar nerve controls several fingers on each hand. The middle and ring. iirc. I started getting that tingling and numbness in my fingers, and it kept getting worse and worse until one day on the train I was thinking "ok, something is REALLY wrong" and went to a specialist my general referred me to.

He agreed that it seemed my ulnar neve was getting pinched by my elbow, most likely (i had Google around, and while I don't think googling equals an experienced doctor, I told him my symptoms, what I read up on, and asked if he thought it was something like that. To my surprise he agreed after some tests and asking me questions).

He told me to start sleeping in a manner where I couldn't curl or fold my arms. He even advised taking a small pillow, wrapping it around my arm, and ducttapping it, so I couldn't bend my elbow at night even if I wanted to!

I didn't do that, but I did pay more attention to how I sleep, and kept my arms naturally straight (relaxed) when I slept. I did have an extra pillow, and I'd lay that across my arm, which was enough. Anytime I woke up and my arm was folded, I reextended it.

After a few weeks of that, and the pain and tingling not growing, it started greatly reducing and went away. I still try to sleep with my arms as straight as possible.