I have similar issues, although very little pain. I'll wake up in the middle of the night with both my pinky and ring fingers completely numb. Without fail when this happens, my elbow is bent, and I'm usually on my back. It also happens when sitting at my desk when my left arm is bent. All I have to do is unbend my elbow to get my feeling back.

If I lean on my elbow, I can feel odd sensations in those fingers too.

My neuro said I have TOS, but two other docs, an int med doc and a spinal specialist said I don't. (I saw them for second opinions on my neuropathy and mentioned the TOS diagnosis.) They said it's some kind of nerve issue in your elbow. I have a tendency to believe them.

Because I don't have any pain, though, I'm not terribly concerned about it.