Another cause if it's your pinky finger. You could have irratated your Ulnar nerve. It runs over the point of your elbow and is kind of vulnerable. This is the spot where your "funny bone" is. Mine went to sleep for two years after sleeping on my back on the floor. My elbow was resting on the floor while I was sleeping. When I woke up, it was numb. After several doctor visits, they figured out what happened and that they couldn't help me. The Ulnar nerve services your pinky finger and the side of your ring finger next to it. If your problem is your pinky, I'll bet it's also on half your ring finger. It eventually went away and is normal. However I CAN make it numb by doing the same thing.