Welp I must be normal. I always just chalked it up to sleeping on my side. I was lifting heavier a while back and stopped due to the pain. I lowered things and now it's much better. Still get a sting ...

You should look into side sleeper pillows. I got one this Christmas (per my request) and it's actually helped a lot. It gives you a cavity for you arm to relieve the pressure your head and neck put on ...