Re: waking up to numb arms and hands ?
I've been told that most neurological episodes happen when you're lying or sitting down. Scientifically speaking, I don't know that this is true but observationally, this seems to be the case.
What you're describing is my most enduring sx. I do have days where I don't wake up with a hand still asleep but it's pretty common for me. Thankfully, it passes after a few minutes.
At any rate, you're not alone here at all!!